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Source file src/go/types/api_test.go

Documentation: go/types

  // Copyright 2013 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package types_test
  
  import (
  	"bytes"
  	"fmt"
  	"go/ast"
  	"go/importer"
  	"go/parser"
  	"go/token"
  	"internal/testenv"
  	"reflect"
  	"regexp"
  	"strings"
  	"testing"
  
  	. "go/types"
  )
  
  func pkgFor(path, source string, info *Info) (*Package, error) {
  	fset := token.NewFileSet()
  	f, err := parser.ParseFile(fset, path, source, 0)
  	if err != nil {
  		return nil, err
  	}
  
  	conf := Config{Importer: importer.Default()}
  	return conf.Check(f.Name.Name, fset, []*ast.File{f}, info)
  }
  
  func mustTypecheck(t *testing.T, path, source string, info *Info) string {
  	pkg, err := pkgFor(path, source, info)
  	if err != nil {
  		name := path
  		if pkg != nil {
  			name = "package " + pkg.Name()
  		}
  		t.Fatalf("%s: didn't type-check (%s)", name, err)
  	}
  	return pkg.Name()
  }
  
  func TestValuesInfo(t *testing.T) {
  	var tests = []struct {
  		src  string
  		expr string // constant expression
  		typ  string // constant type
  		val  string // constant value
  	}{
  		{`package a0; const _ = false`, `false`, `untyped bool`, `false`},
  		{`package a1; const _ = 0`, `0`, `untyped int`, `0`},
  		{`package a2; const _ = 'A'`, `'A'`, `untyped rune`, `65`},
  		{`package a3; const _ = 0.`, `0.`, `untyped float`, `0`},
  		{`package a4; const _ = 0i`, `0i`, `untyped complex`, `(0 + 0i)`},
  		{`package a5; const _ = "foo"`, `"foo"`, `untyped string`, `"foo"`},
  
  		{`package b0; var _ = false`, `false`, `bool`, `false`},
  		{`package b1; var _ = 0`, `0`, `int`, `0`},
  		{`package b2; var _ = 'A'`, `'A'`, `rune`, `65`},
  		{`package b3; var _ = 0.`, `0.`, `float64`, `0`},
  		{`package b4; var _ = 0i`, `0i`, `complex128`, `(0 + 0i)`},
  		{`package b5; var _ = "foo"`, `"foo"`, `string`, `"foo"`},
  
  		{`package c0a; var _ = bool(false)`, `false`, `bool`, `false`},
  		{`package c0b; var _ = bool(false)`, `bool(false)`, `bool`, `false`},
  		{`package c0c; type T bool; var _ = T(false)`, `T(false)`, `c0c.T`, `false`},
  
  		{`package c1a; var _ = int(0)`, `0`, `int`, `0`},
  		{`package c1b; var _ = int(0)`, `int(0)`, `int`, `0`},
  		{`package c1c; type T int; var _ = T(0)`, `T(0)`, `c1c.T`, `0`},
  
  		{`package c2a; var _ = rune('A')`, `'A'`, `rune`, `65`},
  		{`package c2b; var _ = rune('A')`, `rune('A')`, `rune`, `65`},
  		{`package c2c; type T rune; var _ = T('A')`, `T('A')`, `c2c.T`, `65`},
  
  		{`package c3a; var _ = float32(0.)`, `0.`, `float32`, `0`},
  		{`package c3b; var _ = float32(0.)`, `float32(0.)`, `float32`, `0`},
  		{`package c3c; type T float32; var _ = T(0.)`, `T(0.)`, `c3c.T`, `0`},
  
  		{`package c4a; var _ = complex64(0i)`, `0i`, `complex64`, `(0 + 0i)`},
  		{`package c4b; var _ = complex64(0i)`, `complex64(0i)`, `complex64`, `(0 + 0i)`},
  		{`package c4c; type T complex64; var _ = T(0i)`, `T(0i)`, `c4c.T`, `(0 + 0i)`},
  
  		{`package c5a; var _ = string("foo")`, `"foo"`, `string`, `"foo"`},
  		{`package c5b; var _ = string("foo")`, `string("foo")`, `string`, `"foo"`},
  		{`package c5c; type T string; var _ = T("foo")`, `T("foo")`, `c5c.T`, `"foo"`},
  
  		{`package d0; var _ = []byte("foo")`, `"foo"`, `string`, `"foo"`},
  		{`package d1; var _ = []byte(string("foo"))`, `"foo"`, `string`, `"foo"`},
  		{`package d2; var _ = []byte(string("foo"))`, `string("foo")`, `string`, `"foo"`},
  		{`package d3; type T []byte; var _ = T("foo")`, `"foo"`, `string`, `"foo"`},
  
  		{`package e0; const _ = float32( 1e-200)`, `float32(1e-200)`, `float32`, `0`},
  		{`package e1; const _ = float32(-1e-200)`, `float32(-1e-200)`, `float32`, `0`},
  		{`package e2; const _ = float64( 1e-2000)`, `float64(1e-2000)`, `float64`, `0`},
  		{`package e3; const _ = float64(-1e-2000)`, `float64(-1e-2000)`, `float64`, `0`},
  		{`package e4; const _ = complex64( 1e-200)`, `complex64(1e-200)`, `complex64`, `(0 + 0i)`},
  		{`package e5; const _ = complex64(-1e-200)`, `complex64(-1e-200)`, `complex64`, `(0 + 0i)`},
  		{`package e6; const _ = complex128( 1e-2000)`, `complex128(1e-2000)`, `complex128`, `(0 + 0i)`},
  		{`package e7; const _ = complex128(-1e-2000)`, `complex128(-1e-2000)`, `complex128`, `(0 + 0i)`},
  
  		{`package f0 ; var _ float32 =  1e-200`, `1e-200`, `float32`, `0`},
  		{`package f1 ; var _ float32 = -1e-200`, `-1e-200`, `float32`, `0`},
  		{`package f2a; var _ float64 =  1e-2000`, `1e-2000`, `float64`, `0`},
  		{`package f3a; var _ float64 = -1e-2000`, `-1e-2000`, `float64`, `0`},
  		{`package f2b; var _         =  1e-2000`, `1e-2000`, `float64`, `0`},
  		{`package f3b; var _         = -1e-2000`, `-1e-2000`, `float64`, `0`},
  		{`package f4 ; var _ complex64  =  1e-200 `, `1e-200`, `complex64`, `(0 + 0i)`},
  		{`package f5 ; var _ complex64  = -1e-200 `, `-1e-200`, `complex64`, `(0 + 0i)`},
  		{`package f6a; var _ complex128 =  1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
  		{`package f7a; var _ complex128 = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
  		{`package f6b; var _            =  1e-2000i`, `1e-2000i`, `complex128`, `(0 + 0i)`},
  		{`package f7b; var _            = -1e-2000i`, `-1e-2000i`, `complex128`, `(0 + 0i)`},
  	}
  
  	for _, test := range tests {
  		info := Info{
  			Types: make(map[ast.Expr]TypeAndValue),
  		}
  		name := mustTypecheck(t, "ValuesInfo", test.src, &info)
  
  		// look for constant expression
  		var expr ast.Expr
  		for e := range info.Types {
  			if ExprString(e) == test.expr {
  				expr = e
  				break
  			}
  		}
  		if expr == nil {
  			t.Errorf("package %s: no expression found for %s", name, test.expr)
  			continue
  		}
  		tv := info.Types[expr]
  
  		// check that type is correct
  		if got := tv.Type.String(); got != test.typ {
  			t.Errorf("package %s: got type %s; want %s", name, got, test.typ)
  			continue
  		}
  
  		// check that value is correct
  		if got := tv.Value.ExactString(); got != test.val {
  			t.Errorf("package %s: got value %s; want %s", name, got, test.val)
  		}
  	}
  }
  
  func TestTypesInfo(t *testing.T) {
  	var tests = []struct {
  		src  string
  		expr string // expression
  		typ  string // value type
  	}{
  		// single-valued expressions of untyped constants
  		{`package b0; var x interface{} = false`, `false`, `bool`},
  		{`package b1; var x interface{} = 0`, `0`, `int`},
  		{`package b2; var x interface{} = 0.`, `0.`, `float64`},
  		{`package b3; var x interface{} = 0i`, `0i`, `complex128`},
  		{`package b4; var x interface{} = "foo"`, `"foo"`, `string`},
  
  		// comma-ok expressions
  		{`package p0; var x interface{}; var _, _ = x.(int)`,
  			`x.(int)`,
  			`(int, bool)`,
  		},
  		{`package p1; var x interface{}; func _() { _, _ = x.(int) }`,
  			`x.(int)`,
  			`(int, bool)`,
  		},
  		{`package p2a; type mybool bool; var m map[string]complex128; var b mybool; func _() { _, b = m["foo"] }`,
  			`m["foo"]`,
  			`(complex128, p2a.mybool)`,
  		},
  		{`package p2b; var m map[string]complex128; var b bool; func _() { _, b = m["foo"] }`,
  			`m["foo"]`,
  			`(complex128, bool)`,
  		},
  		{`package p3; var c chan string; var _, _ = <-c`,
  			`<-c`,
  			`(string, bool)`,
  		},
  
  		// issue 6796
  		{`package issue6796_a; var x interface{}; var _, _ = (x.(int))`,
  			`x.(int)`,
  			`(int, bool)`,
  		},
  		{`package issue6796_b; var c chan string; var _, _ = (<-c)`,
  			`(<-c)`,
  			`(string, bool)`,
  		},
  		{`package issue6796_c; var c chan string; var _, _ = (<-c)`,
  			`<-c`,
  			`(string, bool)`,
  		},
  		{`package issue6796_d; var c chan string; var _, _ = ((<-c))`,
  			`(<-c)`,
  			`(string, bool)`,
  		},
  		{`package issue6796_e; func f(c chan string) { _, _ = ((<-c)) }`,
  			`(<-c)`,
  			`(string, bool)`,
  		},
  
  		// issue 7060
  		{`package issue7060_a; var ( m map[int]string; x, ok = m[0] )`,
  			`m[0]`,
  			`(string, bool)`,
  		},
  		{`package issue7060_b; var ( m map[int]string; x, ok interface{} = m[0] )`,
  			`m[0]`,
  			`(string, bool)`,
  		},
  		{`package issue7060_c; func f(x interface{}, ok bool, m map[int]string) { x, ok = m[0] }`,
  			`m[0]`,
  			`(string, bool)`,
  		},
  		{`package issue7060_d; var ( ch chan string; x, ok = <-ch )`,
  			`<-ch`,
  			`(string, bool)`,
  		},
  		{`package issue7060_e; var ( ch chan string; x, ok interface{} = <-ch )`,
  			`<-ch`,
  			`(string, bool)`,
  		},
  		{`package issue7060_f; func f(x interface{}, ok bool, ch chan string) { x, ok = <-ch }`,
  			`<-ch`,
  			`(string, bool)`,
  		},
  	}
  
  	for _, test := range tests {
  		info := Info{Types: make(map[ast.Expr]TypeAndValue)}
  		name := mustTypecheck(t, "TypesInfo", test.src, &info)
  
  		// look for expression type
  		var typ Type
  		for e, tv := range info.Types {
  			if ExprString(e) == test.expr {
  				typ = tv.Type
  				break
  			}
  		}
  		if typ == nil {
  			t.Errorf("package %s: no type found for %s", name, test.expr)
  			continue
  		}
  
  		// check that type is correct
  		if got := typ.String(); got != test.typ {
  			t.Errorf("package %s: got %s; want %s", name, got, test.typ)
  		}
  	}
  }
  
  func predString(tv TypeAndValue) string {
  	var buf bytes.Buffer
  	pred := func(b bool, s string) {
  		if b {
  			if buf.Len() > 0 {
  				buf.WriteString(", ")
  			}
  			buf.WriteString(s)
  		}
  	}
  
  	pred(tv.IsVoid(), "void")
  	pred(tv.IsType(), "type")
  	pred(tv.IsBuiltin(), "builtin")
  	pred(tv.IsValue() && tv.Value != nil, "const")
  	pred(tv.IsValue() && tv.Value == nil, "value")
  	pred(tv.IsNil(), "nil")
  	pred(tv.Addressable(), "addressable")
  	pred(tv.Assignable(), "assignable")
  	pred(tv.HasOk(), "hasOk")
  
  	if buf.Len() == 0 {
  		return "invalid"
  	}
  	return buf.String()
  }
  
  func TestPredicatesInfo(t *testing.T) {
  	testenv.MustHaveGoBuild(t)
  
  	var tests = []struct {
  		src  string
  		expr string
  		pred string
  	}{
  		// void
  		{`package n0; func f() { f() }`, `f()`, `void`},
  
  		// types
  		{`package t0; type _ int`, `int`, `type`},
  		{`package t1; type _ []int`, `[]int`, `type`},
  		{`package t2; type _ func()`, `func()`, `type`},
  
  		// built-ins
  		{`package b0; var _ = len("")`, `len`, `builtin`},
  		{`package b1; var _ = (len)("")`, `(len)`, `builtin`},
  
  		// constants
  		{`package c0; var _ = 42`, `42`, `const`},
  		{`package c1; var _ = "foo" + "bar"`, `"foo" + "bar"`, `const`},
  		{`package c2; const (i = 1i; _ = i)`, `i`, `const`},
  
  		// values
  		{`package v0; var (a, b int; _ = a + b)`, `a + b`, `value`},
  		{`package v1; var _ = &[]int{1}`, `([]int literal)`, `value`},
  		{`package v2; var _ = func(){}`, `(func() literal)`, `value`},
  		{`package v4; func f() { _ = f }`, `f`, `value`},
  		{`package v3; var _ *int = nil`, `nil`, `value, nil`},
  		{`package v3; var _ *int = (nil)`, `(nil)`, `value, nil`},
  
  		// addressable (and thus assignable) operands
  		{`package a0; var (x int; _ = x)`, `x`, `value, addressable, assignable`},
  		{`package a1; var (p *int; _ = *p)`, `*p`, `value, addressable, assignable`},
  		{`package a2; var (s []int; _ = s[0])`, `s[0]`, `value, addressable, assignable`},
  		{`package a3; var (s struct{f int}; _ = s.f)`, `s.f`, `value, addressable, assignable`},
  		{`package a4; var (a [10]int; _ = a[0])`, `a[0]`, `value, addressable, assignable`},
  		{`package a5; func _(x int) { _ = x }`, `x`, `value, addressable, assignable`},
  		{`package a6; func _()(x int) { _ = x; return }`, `x`, `value, addressable, assignable`},
  		{`package a7; type T int; func (x T) _() { _ = x }`, `x`, `value, addressable, assignable`},
  		// composite literals are not addressable
  
  		// assignable but not addressable values
  		{`package s0; var (m map[int]int; _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
  		{`package s1; var (m map[int]int; _, _ = m[0])`, `m[0]`, `value, assignable, hasOk`},
  
  		// hasOk expressions
  		{`package k0; var (ch chan int; _ = <-ch)`, `<-ch`, `value, hasOk`},
  		{`package k1; var (ch chan int; _, _ = <-ch)`, `<-ch`, `value, hasOk`},
  
  		// missing entries
  		// - package names are collected in the Uses map
  		// - identifiers being declared are collected in the Defs map
  		{`package m0; import "os"; func _() { _ = os.Stdout }`, `os`, `<missing>`},
  		{`package m1; import p "os"; func _() { _ = p.Stdout }`, `p`, `<missing>`},
  		{`package m2; const c = 0`, `c`, `<missing>`},
  		{`package m3; type T int`, `T`, `<missing>`},
  		{`package m4; var v int`, `v`, `<missing>`},
  		{`package m5; func f() {}`, `f`, `<missing>`},
  		{`package m6; func _(x int) {}`, `x`, `<missing>`},
  		{`package m6; func _()(x int) { return }`, `x`, `<missing>`},
  		{`package m6; type T int; func (x T) _() {}`, `x`, `<missing>`},
  	}
  
  	for _, test := range tests {
  		info := Info{Types: make(map[ast.Expr]TypeAndValue)}
  		name := mustTypecheck(t, "PredicatesInfo", test.src, &info)
  
  		// look for expression predicates
  		got := "<missing>"
  		for e, tv := range info.Types {
  			//println(name, ExprString(e))
  			if ExprString(e) == test.expr {
  				got = predString(tv)
  				break
  			}
  		}
  
  		if got != test.pred {
  			t.Errorf("package %s: got %s; want %s", name, got, test.pred)
  		}
  	}
  }
  
  func TestScopesInfo(t *testing.T) {
  	testenv.MustHaveGoBuild(t)
  
  	var tests = []struct {
  		src    string
  		scopes []string // list of scope descriptors of the form kind:varlist
  	}{
  		{`package p0`, []string{
  			"file:",
  		}},
  		{`package p1; import ( "fmt"; m "math"; _ "os" ); var ( _ = fmt.Println; _ = m.Pi )`, []string{
  			"file:fmt m",
  		}},
  		{`package p2; func _() {}`, []string{
  			"file:", "func:",
  		}},
  		{`package p3; func _(x, y int) {}`, []string{
  			"file:", "func:x y",
  		}},
  		{`package p4; func _(x, y int) { x, z := 1, 2; _ = z }`, []string{
  			"file:", "func:x y z", // redeclaration of x
  		}},
  		{`package p5; func _(x, y int) (u, _ int) { return }`, []string{
  			"file:", "func:u x y",
  		}},
  		{`package p6; func _() { { var x int; _ = x } }`, []string{
  			"file:", "func:", "block:x",
  		}},
  		{`package p7; func _() { if true {} }`, []string{
  			"file:", "func:", "if:", "block:",
  		}},
  		{`package p8; func _() { if x := 0; x < 0 { y := x; _ = y } }`, []string{
  			"file:", "func:", "if:x", "block:y",
  		}},
  		{`package p9; func _() { switch x := 0; x {} }`, []string{
  			"file:", "func:", "switch:x",
  		}},
  		{`package p10; func _() { switch x := 0; x { case 1: y := x; _ = y; default: }}`, []string{
  			"file:", "func:", "switch:x", "case:y", "case:",
  		}},
  		{`package p11; func _(t interface{}) { switch t.(type) {} }`, []string{
  			"file:", "func:t", "type switch:",
  		}},
  		{`package p12; func _(t interface{}) { switch t := t; t.(type) {} }`, []string{
  			"file:", "func:t", "type switch:t",
  		}},
  		{`package p13; func _(t interface{}) { switch x := t.(type) { case int: _ = x } }`, []string{
  			"file:", "func:t", "type switch:", "case:x", // x implicitly declared
  		}},
  		{`package p14; func _() { select{} }`, []string{
  			"file:", "func:",
  		}},
  		{`package p15; func _(c chan int) { select{ case <-c: } }`, []string{
  			"file:", "func:c", "comm:",
  		}},
  		{`package p16; func _(c chan int) { select{ case i := <-c: x := i; _ = x} }`, []string{
  			"file:", "func:c", "comm:i x",
  		}},
  		{`package p17; func _() { for{} }`, []string{
  			"file:", "func:", "for:", "block:",
  		}},
  		{`package p18; func _(n int) { for i := 0; i < n; i++ { _ = i } }`, []string{
  			"file:", "func:n", "for:i", "block:",
  		}},
  		{`package p19; func _(a []int) { for i := range a { _ = i} }`, []string{
  			"file:", "func:a", "range:i", "block:",
  		}},
  		{`package p20; var s int; func _(a []int) { for i, x := range a { s += x; _ = i } }`, []string{
  			"file:", "func:a", "range:i x", "block:",
  		}},
  	}
  
  	for _, test := range tests {
  		info := Info{Scopes: make(map[ast.Node]*Scope)}
  		name := mustTypecheck(t, "ScopesInfo", test.src, &info)
  
  		// number of scopes must match
  		if len(info.Scopes) != len(test.scopes) {
  			t.Errorf("package %s: got %d scopes; want %d", name, len(info.Scopes), len(test.scopes))
  		}
  
  		// scope descriptions must match
  		for node, scope := range info.Scopes {
  			kind := "<unknown node kind>"
  			switch node.(type) {
  			case *ast.File:
  				kind = "file"
  			case *ast.FuncType:
  				kind = "func"
  			case *ast.BlockStmt:
  				kind = "block"
  			case *ast.IfStmt:
  				kind = "if"
  			case *ast.SwitchStmt:
  				kind = "switch"
  			case *ast.TypeSwitchStmt:
  				kind = "type switch"
  			case *ast.CaseClause:
  				kind = "case"
  			case *ast.CommClause:
  				kind = "comm"
  			case *ast.ForStmt:
  				kind = "for"
  			case *ast.RangeStmt:
  				kind = "range"
  			}
  
  			// look for matching scope description
  			desc := kind + ":" + strings.Join(scope.Names(), " ")
  			found := false
  			for _, d := range test.scopes {
  				if desc == d {
  					found = true
  					break
  				}
  			}
  			if !found {
  				t.Errorf("package %s: no matching scope found for %s", name, desc)
  			}
  		}
  	}
  }
  
  func TestInitOrderInfo(t *testing.T) {
  	var tests = []struct {
  		src   string
  		inits []string
  	}{
  		{`package p0; var (x = 1; y = x)`, []string{
  			"x = 1", "y = x",
  		}},
  		{`package p1; var (a = 1; b = 2; c = 3)`, []string{
  			"a = 1", "b = 2", "c = 3",
  		}},
  		{`package p2; var (a, b, c = 1, 2, 3)`, []string{
  			"a = 1", "b = 2", "c = 3",
  		}},
  		{`package p3; var _ = f(); func f() int { return 1 }`, []string{
  			"_ = f()", // blank var
  		}},
  		{`package p4; var (a = 0; x = y; y = z; z = 0)`, []string{
  			"a = 0", "z = 0", "y = z", "x = y",
  		}},
  		{`package p5; var (a, _ = m[0]; m map[int]string)`, []string{
  			"a, _ = m[0]", // blank var
  		}},
  		{`package p6; var a, b = f(); func f() (_, _ int) { return z, z }; var z = 0`, []string{
  			"z = 0", "a, b = f()",
  		}},
  		{`package p7; var (a = func() int { return b }(); b = 1)`, []string{
  			"b = 1", "a = (func() int literal)()",
  		}},
  		{`package p8; var (a, b = func() (_, _ int) { return c, c }(); c = 1)`, []string{
  			"c = 1", "a, b = (func() (_, _ int) literal)()",
  		}},
  		{`package p9; type T struct{}; func (T) m() int { _ = y; return 0 }; var x, y = T.m, 1`, []string{
  			"y = 1", "x = T.m",
  		}},
  		{`package p10; var (d = c + b; a = 0; b = 0; c = 0)`, []string{
  			"a = 0", "b = 0", "c = 0", "d = c + b",
  		}},
  		{`package p11; var (a = e + c; b = d + c; c = 0; d = 0; e = 0)`, []string{
  			"c = 0", "d = 0", "b = d + c", "e = 0", "a = e + c",
  		}},
  		// emit an initializer for n:1 initializations only once (not for each node
  		// on the lhs which may appear in different order in the dependency graph)
  		{`package p12; var (a = x; b = 0; x, y = m[0]; m map[int]int)`, []string{
  			"b = 0", "x, y = m[0]", "a = x",
  		}},
  		// test case from spec section on package initialization
  		{`package p12
  
  		var (
  			a = c + b
  			b = f()
  			c = f()
  			d = 3
  		)
  
  		func f() int {
  			d++
  			return d
  		}`, []string{
  			"d = 3", "b = f()", "c = f()", "a = c + b",
  		}},
  		// test case for issue 7131
  		{`package main
  
  		var counter int
  		func next() int { counter++; return counter }
  
  		var _ = makeOrder()
  		func makeOrder() []int { return []int{f, b, d, e, c, a} }
  
  		var a       = next()
  		var b, c    = next(), next()
  		var d, e, f = next(), next(), next()
  		`, []string{
  			"a = next()", "b = next()", "c = next()", "d = next()", "e = next()", "f = next()", "_ = makeOrder()",
  		}},
  		// test case for issue 10709
  		{`package p13
  
  		var (
  		    v = t.m()
  		    t = makeT(0)
  		)
  
  		type T struct{}
  
  		func (T) m() int { return 0 }
  
  		func makeT(n int) T {
  		    if n > 0 {
  		        return makeT(n-1)
  		    }
  		    return T{}
  		}`, []string{
  			"t = makeT(0)", "v = t.m()",
  		}},
  		// test case for issue 10709: same as test before, but variable decls swapped
  		{`package p14
  
  		var (
  		    t = makeT(0)
  		    v = t.m()
  		)
  
  		type T struct{}
  
  		func (T) m() int { return 0 }
  
  		func makeT(n int) T {
  		    if n > 0 {
  		        return makeT(n-1)
  		    }
  		    return T{}
  		}`, []string{
  			"t = makeT(0)", "v = t.m()",
  		}},
  		// another candidate possibly causing problems with issue 10709
  		{`package p15
  
  		var y1 = f1()
  
  		func f1() int { return g1() }
  		func g1() int { f1(); return x1 }
  
  		var x1 = 0
  
  		var y2 = f2()
  
  		func f2() int { return g2() }
  		func g2() int { return x2 }
  
  		var x2 = 0`, []string{
  			"x1 = 0", "y1 = f1()", "x2 = 0", "y2 = f2()",
  		}},
  	}
  
  	for _, test := range tests {
  		info := Info{}
  		name := mustTypecheck(t, "InitOrderInfo", test.src, &info)
  
  		// number of initializers must match
  		if len(info.InitOrder) != len(test.inits) {
  			t.Errorf("package %s: got %d initializers; want %d", name, len(info.InitOrder), len(test.inits))
  			continue
  		}
  
  		// initializers must match
  		for i, want := range test.inits {
  			got := info.InitOrder[i].String()
  			if got != want {
  				t.Errorf("package %s, init %d: got %s; want %s", name, i, got, want)
  				continue
  			}
  		}
  	}
  }
  
  func TestMultiFileInitOrder(t *testing.T) {
  	fset := token.NewFileSet()
  	mustParse := func(src string) *ast.File {
  		f, err := parser.ParseFile(fset, "main", src, 0)
  		if err != nil {
  			t.Fatal(err)
  		}
  		return f
  	}
  
  	fileA := mustParse(`package main; var a = 1`)
  	fileB := mustParse(`package main; var b = 2`)
  
  	// The initialization order must not depend on the parse
  	// order of the files, only on the presentation order to
  	// the type-checker.
  	for _, test := range []struct {
  		files []*ast.File
  		want  string
  	}{
  		{[]*ast.File{fileA, fileB}, "[a = 1 b = 2]"},
  		{[]*ast.File{fileB, fileA}, "[b = 2 a = 1]"},
  	} {
  		var info Info
  		if _, err := new(Config).Check("main", fset, test.files, &info); err != nil {
  			t.Fatal(err)
  		}
  		if got := fmt.Sprint(info.InitOrder); got != test.want {
  			t.Fatalf("got %s; want %s", got, test.want)
  		}
  	}
  }
  
  func TestFiles(t *testing.T) {
  	var sources = []string{
  		"package p; type T struct{}; func (T) m1() {}",
  		"package p; func (T) m2() {}; var x interface{ m1(); m2() } = T{}",
  		"package p; func (T) m3() {}; var y interface{ m1(); m2(); m3() } = T{}",
  		"package p",
  	}
  
  	var conf Config
  	fset := token.NewFileSet()
  	pkg := NewPackage("p", "p")
  	var info Info
  	check := NewChecker(&conf, fset, pkg, &info)
  
  	for i, src := range sources {
  		filename := fmt.Sprintf("sources%d", i)
  		f, err := parser.ParseFile(fset, filename, src, 0)
  		if err != nil {
  			t.Fatal(err)
  		}
  		if err := check.Files([]*ast.File{f}); err != nil {
  			t.Error(err)
  		}
  	}
  
  	// check InitOrder is [x y]
  	var vars []string
  	for _, init := range info.InitOrder {
  		for _, v := range init.Lhs {
  			vars = append(vars, v.Name())
  		}
  	}
  	if got, want := fmt.Sprint(vars), "[x y]"; got != want {
  		t.Errorf("InitOrder == %s, want %s", got, want)
  	}
  }
  
  type testImporter map[string]*Package
  
  func (m testImporter) Import(path string) (*Package, error) {
  	if pkg := m[path]; pkg != nil {
  		return pkg, nil
  	}
  	return nil, fmt.Errorf("package %q not found", path)
  }
  
  func TestSelection(t *testing.T) {
  	selections := make(map[*ast.SelectorExpr]*Selection)
  
  	fset := token.NewFileSet()
  	imports := make(testImporter)
  	conf := Config{Importer: imports}
  	makePkg := func(path, src string) {
  		f, err := parser.ParseFile(fset, path+".go", src, 0)
  		if err != nil {
  			t.Fatal(err)
  		}
  		pkg, err := conf.Check(path, fset, []*ast.File{f}, &Info{Selections: selections})
  		if err != nil {
  			t.Fatal(err)
  		}
  		imports[path] = pkg
  	}
  
  	const libSrc = `
  package lib
  type T float64
  const C T = 3
  var V T
  func F() {}
  func (T) M() {}
  `
  	const mainSrc = `
  package main
  import "lib"
  
  type A struct {
  	*B
  	C
  }
  
  type B struct {
  	b int
  }
  
  func (B) f(int)
  
  type C struct {
  	c int
  }
  
  func (C) g()
  func (*C) h()
  
  func main() {
  	// qualified identifiers
  	var _ lib.T
          _ = lib.C
          _ = lib.F
          _ = lib.V
  	_ = lib.T.M
  
  	// fields
  	_ = A{}.B
  	_ = new(A).B
  
  	_ = A{}.C
  	_ = new(A).C
  
  	_ = A{}.b
  	_ = new(A).b
  
  	_ = A{}.c
  	_ = new(A).c
  
  	// methods
          _ = A{}.f
          _ = new(A).f
          _ = A{}.g
          _ = new(A).g
          _ = new(A).h
  
          _ = B{}.f
          _ = new(B).f
  
          _ = C{}.g
          _ = new(C).g
          _ = new(C).h
  
  	// method expressions
          _ = A.f
          _ = (*A).f
          _ = B.f
          _ = (*B).f
  }`
  
  	wantOut := map[string][2]string{
  		"lib.T.M": {"method expr (lib.T) M(lib.T)", ".[0]"},
  
  		"A{}.B":    {"field (main.A) B *main.B", ".[0]"},
  		"new(A).B": {"field (*main.A) B *main.B", "->[0]"},
  		"A{}.C":    {"field (main.A) C main.C", ".[1]"},
  		"new(A).C": {"field (*main.A) C main.C", "->[1]"},
  		"A{}.b":    {"field (main.A) b int", "->[0 0]"},
  		"new(A).b": {"field (*main.A) b int", "->[0 0]"},
  		"A{}.c":    {"field (main.A) c int", ".[1 0]"},
  		"new(A).c": {"field (*main.A) c int", "->[1 0]"},
  
  		"A{}.f":    {"method (main.A) f(int)", "->[0 0]"},
  		"new(A).f": {"method (*main.A) f(int)", "->[0 0]"},
  		"A{}.g":    {"method (main.A) g()", ".[1 0]"},
  		"new(A).g": {"method (*main.A) g()", "->[1 0]"},
  		"new(A).h": {"method (*main.A) h()", "->[1 1]"}, // TODO(gri) should this report .[1 1] ?
  		"B{}.f":    {"method (main.B) f(int)", ".[0]"},
  		"new(B).f": {"method (*main.B) f(int)", "->[0]"},
  		"C{}.g":    {"method (main.C) g()", ".[0]"},
  		"new(C).g": {"method (*main.C) g()", "->[0]"},
  		"new(C).h": {"method (*main.C) h()", "->[1]"}, // TODO(gri) should this report .[1] ?
  
  		"A.f":    {"method expr (main.A) f(main.A, int)", "->[0 0]"},
  		"(*A).f": {"method expr (*main.A) f(*main.A, int)", "->[0 0]"},
  		"B.f":    {"method expr (main.B) f(main.B, int)", ".[0]"},
  		"(*B).f": {"method expr (*main.B) f(*main.B, int)", "->[0]"},
  	}
  
  	makePkg("lib", libSrc)
  	makePkg("main", mainSrc)
  
  	for e, sel := range selections {
  		_ = sel.String() // assertion: must not panic
  
  		start := fset.Position(e.Pos()).Offset
  		end := fset.Position(e.End()).Offset
  		syntax := mainSrc[start:end] // (all SelectorExprs are in main, not lib)
  
  		direct := "."
  		if sel.Indirect() {
  			direct = "->"
  		}
  		got := [2]string{
  			sel.String(),
  			fmt.Sprintf("%s%v", direct, sel.Index()),
  		}
  		want := wantOut[syntax]
  		if want != got {
  			t.Errorf("%s: got %q; want %q", syntax, got, want)
  		}
  		delete(wantOut, syntax)
  
  		// We must explicitly assert properties of the
  		// Signature's receiver since it doesn't participate
  		// in Identical() or String().
  		sig, _ := sel.Type().(*Signature)
  		if sel.Kind() == MethodVal {
  			got := sig.Recv().Type()
  			want := sel.Recv()
  			if !Identical(got, want) {
  				t.Errorf("%s: Recv() = %s, want %s", syntax, got, want)
  			}
  		} else if sig != nil && sig.Recv() != nil {
  			t.Errorf("%s: signature has receiver %s", sig, sig.Recv().Type())
  		}
  	}
  	// Assert that all wantOut entries were used exactly once.
  	for syntax := range wantOut {
  		t.Errorf("no ast.Selection found with syntax %q", syntax)
  	}
  }
  
  func TestIssue8518(t *testing.T) {
  	fset := token.NewFileSet()
  	imports := make(testImporter)
  	conf := Config{
  		Error:    func(err error) { t.Log(err) }, // don't exit after first error
  		Importer: imports,
  	}
  	makePkg := func(path, src string) {
  		f, err := parser.ParseFile(fset, path, src, 0)
  		if err != nil {
  			t.Fatal(err)
  		}
  		pkg, _ := conf.Check(path, fset, []*ast.File{f}, nil) // errors logged via conf.Error
  		imports[path] = pkg
  	}
  
  	const libSrc = `
  package a
  import "missing"
  const C1 = foo
  const C2 = missing.C
  `
  
  	const mainSrc = `
  package main
  import "a"
  var _ = a.C1
  var _ = a.C2
  `
  
  	makePkg("a", libSrc)
  	makePkg("main", mainSrc) // don't crash when type-checking this package
  }
  
  func TestLookupFieldOrMethod(t *testing.T) {
  	// Test cases assume a lookup of the form a.f or x.f, where a stands for an
  	// addressable value, and x for a non-addressable value (even though a variable
  	// for ease of test case writing).
  	var tests = []struct {
  		src      string
  		found    bool
  		index    []int
  		indirect bool
  	}{
  		// field lookups
  		{"var x T; type T struct{}", false, nil, false},
  		{"var x T; type T struct{ f int }", true, []int{0}, false},
  		{"var x T; type T struct{ a, b, f, c int }", true, []int{2}, false},
  
  		// method lookups
  		{"var a T; type T struct{}; func (T) f() {}", true, []int{0}, false},
  		{"var a *T; type T struct{}; func (T) f() {}", true, []int{0}, true},
  		{"var a T; type T struct{}; func (*T) f() {}", true, []int{0}, false},
  		{"var a *T; type T struct{}; func (*T) f() {}", true, []int{0}, true}, // TODO(gri) should this report indirect = false?
  
  		// collisions
  		{"type ( E1 struct{ f int }; E2 struct{ f int }; x struct{ E1; *E2 })", false, []int{1, 0}, false},
  		{"type ( E1 struct{ f int }; E2 struct{}; x struct{ E1; *E2 }); func (E2) f() {}", false, []int{1, 0}, false},
  
  		// outside methodset
  		// (*T).f method exists, but value of type T is not addressable
  		{"var x T; type T struct{}; func (*T) f() {}", false, nil, true},
  	}
  
  	for _, test := range tests {
  		pkg, err := pkgFor("test", "package p;"+test.src, nil)
  		if err != nil {
  			t.Errorf("%s: incorrect test case: %s", test.src, err)
  			continue
  		}
  
  		obj := pkg.Scope().Lookup("a")
  		if obj == nil {
  			if obj = pkg.Scope().Lookup("x"); obj == nil {
  				t.Errorf("%s: incorrect test case - no object a or x", test.src)
  				continue
  			}
  		}
  
  		f, index, indirect := LookupFieldOrMethod(obj.Type(), obj.Name() == "a", pkg, "f")
  		if (f != nil) != test.found {
  			if f == nil {
  				t.Errorf("%s: got no object; want one", test.src)
  			} else {
  				t.Errorf("%s: got object = %v; want none", test.src, f)
  			}
  		}
  		if !sameSlice(index, test.index) {
  			t.Errorf("%s: got index = %v; want %v", test.src, index, test.index)
  		}
  		if indirect != test.indirect {
  			t.Errorf("%s: got indirect = %v; want %v", test.src, indirect, test.indirect)
  		}
  	}
  }
  
  func sameSlice(a, b []int) bool {
  	if len(a) != len(b) {
  		return false
  	}
  	for i, x := range a {
  		if x != b[i] {
  			return false
  		}
  	}
  	return true
  }
  
  // TestScopeLookupParent ensures that (*Scope).LookupParent returns
  // the correct result at various positions with the source.
  func TestScopeLookupParent(t *testing.T) {
  	fset := token.NewFileSet()
  	imports := make(testImporter)
  	conf := Config{Importer: imports}
  	mustParse := func(src string) *ast.File {
  		f, err := parser.ParseFile(fset, "dummy.go", src, parser.ParseComments)
  		if err != nil {
  			t.Fatal(err)
  		}
  		return f
  	}
  	var info Info
  	makePkg := func(path string, files ...*ast.File) {
  		var err error
  		imports[path], err = conf.Check(path, fset, files, &info)
  		if err != nil {
  			t.Fatal(err)
  		}
  	}
  
  	makePkg("lib", mustParse("package lib; var X int"))
  	// Each /*name=kind:line*/ comment makes the test look up the
  	// name at that point and checks that it resolves to a decl of
  	// the specified kind and line number.  "undef" means undefined.
  	mainSrc := `
  /*lib=pkgname:5*/ /*X=var:1*/ /*Pi=const:8*/ /*T=typename:9*/ /*Y=var:10*/ /*F=func:12*/
  package main
  
  import "lib"
  import . "lib"
  
  const Pi = 3.1415
  type T struct{}
  var Y, _ = lib.X, X
  
  func F(){
  	const pi, e = 3.1415, /*pi=undef*/ 2.71828 /*pi=const:13*/ /*e=const:13*/
  	type /*t=undef*/ t /*t=typename:14*/ *t
  	print(Y) /*Y=var:10*/
  	x, Y := Y, /*x=undef*/ /*Y=var:10*/ Pi /*x=var:16*/ /*Y=var:16*/ ; _ = x; _ = Y
  	var F = /*F=func:12*/ F /*F=var:17*/ ; _ = F
  
  	var a []int
  	for i, x := range /*i=undef*/ /*x=var:16*/ a /*i=var:20*/ /*x=var:20*/ { _ = i; _ = x }
  
  	var i interface{}
  	switch y := i.(type) { /*y=undef*/
  	case /*y=undef*/ int /*y=var:23*/ :
  	case float32, /*y=undef*/ float64 /*y=var:23*/ :
  	default /*y=var:23*/:
  		println(y)
  	}
  	/*y=undef*/
  
          switch int := i.(type) {
          case /*int=typename:0*/ int /*int=var:31*/ :
          	println(int)
          default /*int=var:31*/ :
          }
  }
  /*main=undef*/
  `
  
  	info.Uses = make(map[*ast.Ident]Object)
  	f := mustParse(mainSrc)
  	makePkg("main", f)
  	mainScope := imports["main"].Scope()
  	rx := regexp.MustCompile(`^/\*(\w*)=([\w:]*)\*/$`)
  	for _, group := range f.Comments {
  		for _, comment := range group.List {
  			// Parse the assertion in the comment.
  			m := rx.FindStringSubmatch(comment.Text)
  			if m == nil {
  				t.Errorf("%s: bad comment: %s",
  					fset.Position(comment.Pos()), comment.Text)
  				continue
  			}
  			name, want := m[1], m[2]
  
  			// Look up the name in the innermost enclosing scope.
  			inner := mainScope.Innermost(comment.Pos())
  			if inner == nil {
  				t.Errorf("%s: at %s: can't find innermost scope",
  					fset.Position(comment.Pos()), comment.Text)
  				continue
  			}
  			got := "undef"
  			if _, obj := inner.LookupParent(name, comment.Pos()); obj != nil {
  				kind := strings.ToLower(strings.TrimPrefix(reflect.TypeOf(obj).String(), "*types."))
  				got = fmt.Sprintf("%s:%d", kind, fset.Position(obj.Pos()).Line)
  			}
  			if got != want {
  				t.Errorf("%s: at %s: %s resolved to %s, want %s",
  					fset.Position(comment.Pos()), comment.Text, name, got, want)
  			}
  		}
  	}
  
  	// Check that for each referring identifier,
  	// a lookup of its name on the innermost
  	// enclosing scope returns the correct object.
  
  	for id, wantObj := range info.Uses {
  		inner := mainScope.Innermost(id.Pos())
  		if inner == nil {
  			t.Errorf("%s: can't find innermost scope enclosing %q",
  				fset.Position(id.Pos()), id.Name)
  			continue
  		}
  
  		// Exclude selectors and qualified identifiers---lexical
  		// refs only.  (Ideally, we'd see if the AST parent is a
  		// SelectorExpr, but that requires PathEnclosingInterval
  		// from golang.org/x/tools/go/ast/astutil.)
  		if id.Name == "X" {
  			continue
  		}
  
  		_, gotObj := inner.LookupParent(id.Name, id.Pos())
  		if gotObj != wantObj {
  			t.Errorf("%s: got %v, want %v",
  				fset.Position(id.Pos()), gotObj, wantObj)
  			continue
  		}
  	}
  }
  
  func TestIdentical_issue15173(t *testing.T) {
  	// Identical should allow nil arguments and be symmetric.
  	for _, test := range []struct {
  		x, y Type
  		want bool
  	}{
  		{Typ[Int], Typ[Int], true},
  		{Typ[Int], nil, false},
  		{nil, Typ[Int], false},
  		{nil, nil, true},
  	} {
  		if got := Identical(test.x, test.y); got != test.want {
  			t.Errorf("Identical(%v, %v) = %t", test.x, test.y, got)
  		}
  	}
  }
  
  func TestIssue15305(t *testing.T) {
  	const src = "package p; func f() int16; var _ = f(undef)"
  	fset := token.NewFileSet()
  	f, err := parser.ParseFile(fset, "issue15305.go", src, 0)
  	if err != nil {
  		t.Fatal(err)
  	}
  	conf := Config{
  		Error: func(err error) {}, // allow errors
  	}
  	info := &Info{
  		Types: make(map[ast.Expr]TypeAndValue),
  	}
  	conf.Check("p", fset, []*ast.File{f}, info) // ignore result
  	for e, tv := range info.Types {
  		if _, ok := e.(*ast.CallExpr); ok {
  			if tv.Type != Typ[Int16] {
  				t.Errorf("CallExpr has type %v, want int16", tv.Type)
  			}
  			return
  		}
  	}
  	t.Errorf("CallExpr has no type")
  }
  
  // TestCompositeLitTypes verifies that Info.Types registers the correct
  // types for composite literal expressions and composite literal type
  // expressions.
  func TestCompositeLitTypes(t *testing.T) {
  	for _, test := range []struct {
  		lit, typ string
  	}{
  		{`[16]byte{}`, `[16]byte`},
  		{`[...]byte{}`, `[0]byte`},                // test for issue #14092
  		{`[...]int{1, 2, 3}`, `[3]int`},           // test for issue #14092
  		{`[...]int{90: 0, 98: 1, 2}`, `[100]int`}, // test for issue #14092
  		{`[]int{}`, `[]int`},
  		{`map[string]bool{"foo": true}`, `map[string]bool`},
  		{`struct{}{}`, `struct{}`},
  		{`struct{x, y int; z complex128}{}`, `struct{x int; y int; z complex128}`},
  	} {
  		fset := token.NewFileSet()
  		f, err := parser.ParseFile(fset, test.lit, "package p; var _ = "+test.lit, 0)
  		if err != nil {
  			t.Fatalf("%s: %v", test.lit, err)
  		}
  
  		info := &Info{
  			Types: make(map[ast.Expr]TypeAndValue),
  		}
  		if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
  			t.Fatalf("%s: %v", test.lit, err)
  		}
  
  		cmptype := func(x ast.Expr, want string) {
  			tv, ok := info.Types[x]
  			if !ok {
  				t.Errorf("%s: no Types entry found", test.lit)
  				return
  			}
  			if tv.Type == nil {
  				t.Errorf("%s: type is nil", test.lit)
  				return
  			}
  			if got := tv.Type.String(); got != want {
  				t.Errorf("%s: got %v, want %s", test.lit, got, want)
  			}
  		}
  
  		// test type of composite literal expression
  		rhs := f.Decls[0].(*ast.GenDecl).Specs[0].(*ast.ValueSpec).Values[0]
  		cmptype(rhs, test.typ)
  
  		// test type of composite literal type expression
  		cmptype(rhs.(*ast.CompositeLit).Type, test.typ)
  	}
  }
  
  // TestObjectParents verifies that objects have parent scopes or not
  // as specified by the Object interface.
  func TestObjectParents(t *testing.T) {
  	const src = `
  package p
  
  const C = 0
  
  type T1 struct {
  	a, b int
  	T2
  }
  
  type T2 interface {
  	im1()
  	im2()
  }
  
  func (T1) m1() {}
  func (*T1) m2() {}
  
  func f(x int) { y := x; print(y) }
  `
  
  	fset := token.NewFileSet()
  	f, err := parser.ParseFile(fset, "src", src, 0)
  	if err != nil {
  		t.Fatal(err)
  	}
  
  	info := &Info{
  		Defs: make(map[*ast.Ident]Object),
  	}
  	if _, err = new(Config).Check("p", fset, []*ast.File{f}, info); err != nil {
  		t.Fatal(err)
  	}
  
  	for ident, obj := range info.Defs {
  		if obj == nil {
  			// only package names and implicit vars have a nil object
  			// (in this test we only need to handle the package name)
  			if ident.Name != "p" {
  				t.Errorf("%v has nil object", ident)
  			}
  			continue
  		}
  
  		// struct fields, type-associated and interface methods
  		// have no parent scope
  		wantParent := true
  		switch obj := obj.(type) {
  		case *Var:
  			if obj.IsField() {
  				wantParent = false
  			}
  		case *Func:
  			if obj.Type().(*Signature).Recv() != nil { // method
  				wantParent = false
  			}
  		}
  
  		gotParent := obj.Parent() != nil
  		switch {
  		case gotParent && !wantParent:
  			t.Errorf("%v: want no parent, got %s", ident, obj.Parent())
  		case !gotParent && wantParent:
  			t.Errorf("%v: no parent found", ident)
  		}
  	}
  }
  
  // TestFailedImport tests that we don't get follow-on errors
  // elsewhere in a package due to failing to import a package.
  func TestFailedImport(t *testing.T) {
  	testenv.MustHaveGoBuild(t)
  
  	const src = `
  package p
  
  import "foo" // should only see an error here
  
  const c = foo.C
  type T = foo.T
  var v T = c
  func f(x T) T { return foo.F(x) }
  `
  	fset := token.NewFileSet()
  	f, err := parser.ParseFile(fset, "src", src, 0)
  	if err != nil {
  		t.Fatal(err)
  	}
  	files := []*ast.File{f}
  
  	// type-check using all possible importers
  	for _, compiler := range []string{"gc", "gccgo", "source"} {
  		errcount := 0
  		conf := Config{
  			Error: func(err error) {
  				// we should only see the import error
  				if errcount > 0 || !strings.Contains(err.Error(), "could not import foo") {
  					t.Errorf("for %s importer, got unexpected error: %v", compiler, err)
  				}
  				errcount++
  			},
  			Importer: importer.For(compiler, nil),
  		}
  
  		info := &Info{
  			Uses: make(map[*ast.Ident]Object),
  		}
  		pkg, _ := conf.Check("p", fset, files, info)
  		if pkg == nil {
  			t.Errorf("for %s importer, type-checking failed to return a package", compiler)
  			continue
  		}
  
  		imports := pkg.Imports()
  		if len(imports) != 1 {
  			t.Errorf("for %s importer, got %d imports, want 1", compiler, len(imports))
  			continue
  		}
  		imp := imports[0]
  		if imp.Name() != "foo" {
  			t.Errorf(`for %s importer, got %q, want "foo"`, compiler, imp.Name())
  			continue
  		}
  
  		// verify that all uses of foo refer to the imported package foo (imp)
  		for ident, obj := range info.Uses {
  			if ident.Name == "foo" {
  				if obj, ok := obj.(*PkgName); ok {
  					if obj.Imported() != imp {
  						t.Errorf("%s resolved to %v; want %v", ident, obj.Imported(), imp)
  					}
  				} else {
  					t.Errorf("%s resolved to %v; want package name", ident, obj)
  				}
  			}
  		}
  	}
  }
  

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