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Source file src/cmd/vet/testdata/print.go

Documentation: cmd/vet/testdata

  // Copyright 2010 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.
  
  // This file contains tests for the printf checker.
  
  // TODO(rsc): The user-defined wrapper tests are commented out
  // because they produced too many false positives when vet was
  // enabled during go test. See the TODO in ../print.go for a plan
  // to fix that; when it's fixed, uncomment the user-defined wrapper tests.
  
  package testdata
  
  import (
  	"fmt"
  	. "fmt"
  	logpkg "log" // renamed to make it harder to see
  	"math"
  	"os"
  	"testing"
  	"unsafe" // just for test case printing unsafe.Pointer
  	// For testing printf-like functions from external package.
  	// "github.com/foobar/externalprintf"
  )
  
  func UnsafePointerPrintfTest() {
  	var up unsafe.Pointer
  	fmt.Printf("%p, %x %X", up, up, up)
  }
  
  // Error methods that do not satisfy the Error interface and should be checked.
  type errorTest1 int
  
  func (errorTest1) Error(...interface{}) string {
  	return "hi"
  }
  
  type errorTest2 int // Analogous to testing's *T type.
  func (errorTest2) Error(...interface{}) {
  }
  
  type errorTest3 int
  
  func (errorTest3) Error() { // No return value.
  }
  
  type errorTest4 int
  
  func (errorTest4) Error() int { // Different return type.
  	return 3
  }
  
  type errorTest5 int
  
  func (errorTest5) error() { // niladic; don't complain if no args (was bug)
  }
  
  // This function never executes, but it serves as a simple test for the program.
  // Test with make test.
  func PrintfTests() {
  	var b bool
  	var i int
  	var r rune
  	var s string
  	var x float64
  	var p *int
  	var imap map[int]int
  	var fslice []float64
  	var c complex64
  	// Some good format/argtypes
  	fmt.Printf("")
  	fmt.Printf("%b %b %b", 3, i, x)
  	fmt.Printf("%c %c %c %c", 3, i, 'x', r)
  	fmt.Printf("%d %d %d", 3, i, imap)
  	fmt.Printf("%e %e %e %e", 3e9, x, fslice, c)
  	fmt.Printf("%E %E %E %E", 3e9, x, fslice, c)
  	fmt.Printf("%f %f %f %f", 3e9, x, fslice, c)
  	fmt.Printf("%F %F %F %F", 3e9, x, fslice, c)
  	fmt.Printf("%g %g %g %g", 3e9, x, fslice, c)
  	fmt.Printf("%G %G %G %G", 3e9, x, fslice, c)
  	fmt.Printf("%b %b %b %b", 3e9, x, fslice, c)
  	fmt.Printf("%o %o", 3, i)
  	fmt.Printf("%p", p)
  	fmt.Printf("%q %q %q %q", 3, i, 'x', r)
  	fmt.Printf("%s %s %s", "hi", s, []byte{65})
  	fmt.Printf("%t %t", true, b)
  	fmt.Printf("%T %T", 3, i)
  	fmt.Printf("%U %U", 3, i)
  	fmt.Printf("%v %v", 3, i)
  	fmt.Printf("%x %x %x %x", 3, i, "hi", s)
  	fmt.Printf("%X %X %X %X", 3, i, "hi", s)
  	fmt.Printf("%.*s %d %g", 3, "hi", 23, 2.3)
  	fmt.Printf("%s", &stringerv)
  	fmt.Printf("%v", &stringerv)
  	fmt.Printf("%T", &stringerv)
  	fmt.Printf("%s", &embeddedStringerv)
  	fmt.Printf("%v", &embeddedStringerv)
  	fmt.Printf("%T", &embeddedStringerv)
  	fmt.Printf("%v", notstringerv)
  	fmt.Printf("%T", notstringerv)
  	fmt.Printf("%q", stringerarrayv)
  	fmt.Printf("%v", stringerarrayv)
  	fmt.Printf("%s", stringerarrayv)
  	fmt.Printf("%v", notstringerarrayv)
  	fmt.Printf("%T", notstringerarrayv)
  	fmt.Printf("%d", new(Formatter))
  	fmt.Printf("%*%", 2)               // Ridiculous but allowed.
  	fmt.Printf("%s", interface{}(nil)) // Nothing useful we can say.
  
  	fmt.Printf("%g", 1+2i)
  	fmt.Printf("%#e %#E %#f %#F %#g %#G", 1.2, 1.2, 1.2, 1.2, 1.2, 1.2) // OK since Go 1.9
  	// Some bad format/argTypes
  	fmt.Printf("%b", "hi")                      // ERROR "Printf format %b has arg \x22hi\x22 of wrong type string"
  	fmt.Printf("%t", c)                         // ERROR "Printf format %t has arg c of wrong type complex64"
  	fmt.Printf("%t", 1+2i)                      // ERROR "Printf format %t has arg 1 \+ 2i of wrong type complex128"
  	fmt.Printf("%c", 2.3)                       // ERROR "Printf format %c has arg 2.3 of wrong type float64"
  	fmt.Printf("%d", 2.3)                       // ERROR "Printf format %d has arg 2.3 of wrong type float64"
  	fmt.Printf("%e", "hi")                      // ERROR "Printf format %e has arg \x22hi\x22 of wrong type string"
  	fmt.Printf("%E", true)                      // ERROR "Printf format %E has arg true of wrong type bool"
  	fmt.Printf("%f", "hi")                      // ERROR "Printf format %f has arg \x22hi\x22 of wrong type string"
  	fmt.Printf("%F", 'x')                       // ERROR "Printf format %F has arg 'x' of wrong type rune"
  	fmt.Printf("%g", "hi")                      // ERROR "Printf format %g has arg \x22hi\x22 of wrong type string"
  	fmt.Printf("%g", imap)                      // ERROR "Printf format %g has arg imap of wrong type map\[int\]int"
  	fmt.Printf("%G", i)                         // ERROR "Printf format %G has arg i of wrong type int"
  	fmt.Printf("%o", x)                         // ERROR "Printf format %o has arg x of wrong type float64"
  	fmt.Printf("%p", nil)                       // ERROR "Printf format %p has arg nil of wrong type untyped nil"
  	fmt.Printf("%p", 23)                        // ERROR "Printf format %p has arg 23 of wrong type int"
  	fmt.Printf("%q", x)                         // ERROR "Printf format %q has arg x of wrong type float64"
  	fmt.Printf("%s", b)                         // ERROR "Printf format %s has arg b of wrong type bool"
  	fmt.Printf("%s", byte(65))                  // ERROR "Printf format %s has arg byte\(65\) of wrong type byte"
  	fmt.Printf("%t", 23)                        // ERROR "Printf format %t has arg 23 of wrong type int"
  	fmt.Printf("%U", x)                         // ERROR "Printf format %U has arg x of wrong type float64"
  	fmt.Printf("%x", nil)                       // ERROR "Printf format %x has arg nil of wrong type untyped nil"
  	fmt.Printf("%X", 2.3)                       // ERROR "Printf format %X has arg 2.3 of wrong type float64"
  	fmt.Printf("%s", stringerv)                 // ERROR "Printf format %s has arg stringerv of wrong type testdata.ptrStringer"
  	fmt.Printf("%t", stringerv)                 // ERROR "Printf format %t has arg stringerv of wrong type testdata.ptrStringer"
  	fmt.Printf("%s", embeddedStringerv)         // ERROR "Printf format %s has arg embeddedStringerv of wrong type testdata.embeddedStringer"
  	fmt.Printf("%t", embeddedStringerv)         // ERROR "Printf format %t has arg embeddedStringerv of wrong type testdata.embeddedStringer"
  	fmt.Printf("%q", notstringerv)              // ERROR "Printf format %q has arg notstringerv of wrong type testdata.notstringer"
  	fmt.Printf("%t", notstringerv)              // ERROR "Printf format %t has arg notstringerv of wrong type testdata.notstringer"
  	fmt.Printf("%t", stringerarrayv)            // ERROR "Printf format %t has arg stringerarrayv of wrong type testdata.stringerarray"
  	fmt.Printf("%t", notstringerarrayv)         // ERROR "Printf format %t has arg notstringerarrayv of wrong type testdata.notstringerarray"
  	fmt.Printf("%q", notstringerarrayv)         // ERROR "Printf format %q has arg notstringerarrayv of wrong type testdata.notstringerarray"
  	fmt.Printf("%d", BoolFormatter(true))       // ERROR "Printf format %d has arg BoolFormatter\(true\) of wrong type testdata.BoolFormatter"
  	fmt.Printf("%z", FormatterVal(true))        // correct (the type is responsible for formatting)
  	fmt.Printf("%d", FormatterVal(true))        // correct (the type is responsible for formatting)
  	fmt.Printf("%s", nonemptyinterface)         // correct (the type is responsible for formatting)
  	fmt.Printf("%.*s %d %6g", 3, "hi", 23, 'x') // ERROR "Printf format %6g has arg 'x' of wrong type rune"
  	fmt.Println()                               // not an error
  	fmt.Println("%s", "hi")                     // ERROR "Println call has possible formatting directive %s"
  	fmt.Println("%v", "hi")                     // ERROR "Println call has possible formatting directive %v"
  	fmt.Println("%T", "hi")                     // ERROR "Println call has possible formatting directive %T"
  	fmt.Println("0.0%")                         // correct (trailing % couldn't be a formatting directive)
  	fmt.Printf("%s", "hi", 3)                   // ERROR "Printf call needs 1 arg but has 2 args"
  	_ = fmt.Sprintf("%"+("s"), "hi", 3)         // ERROR "Sprintf call needs 1 arg but has 2 args"
  	fmt.Printf("%s%%%d", "hi", 3)               // correct
  	fmt.Printf("%08s", "woo")                   // correct
  	fmt.Printf("% 8s", "woo")                   // correct
  	fmt.Printf("%.*d", 3, 3)                    // correct
  	fmt.Printf("%.*d x", 3, 3, 3, 3)            // ERROR "Printf call needs 2 args but has 4 args"
  	fmt.Printf("%.*d x", "hi", 3)               // ERROR "Printf format %.*d uses non-int \x22hi\x22 as argument of \*"
  	fmt.Printf("%.*d x", i, 3)                  // correct
  	fmt.Printf("%.*d x", s, 3)                  // ERROR "Printf format %.\*d uses non-int s as argument of \*"
  	fmt.Printf("%*% x", 0.22)                   // ERROR "Printf format %\*% uses non-int 0.22 as argument of \*"
  	fmt.Printf("%q %q", multi()...)             // ok
  	fmt.Printf("%#q", `blah`)                   // ok
  	// printf("now is the time", "buddy")          // no error "printf call has arguments but no formatting directives"
  	Printf("now is the time", "buddy") // ERROR "Printf call has arguments but no formatting directives"
  	Printf("hi")                       // ok
  	const format = "%s %s\n"
  	Printf(format, "hi", "there")
  	Printf(format, "hi")              // ERROR "Printf format %s reads arg #2, but call has 1 arg$"
  	Printf("%s %d %.3v %q", "str", 4) // ERROR "Printf format %.3v reads arg #3, but call has 2 args"
  	f := new(ptrStringer)
  	f.Warn(0, "%s", "hello", 3)           // ERROR "Warn call has possible formatting directive %s"
  	f.Warnf(0, "%s", "hello", 3)          // ERROR "Warnf call needs 1 arg but has 2 args"
  	f.Warnf(0, "%r", "hello")             // ERROR "Warnf format %r has unknown verb r"
  	f.Warnf(0, "%#s", "hello")            // ERROR "Warnf format %#s has unrecognized flag #"
  	f.Warn2(0, "%s", "hello", 3)          // ERROR "Warn2 call has possible formatting directive %s"
  	f.Warnf2(0, "%s", "hello", 3)         // ERROR "Warnf2 call needs 1 arg but has 2 args"
  	f.Warnf2(0, "%r", "hello")            // ERROR "Warnf2 format %r has unknown verb r"
  	f.Warnf2(0, "%#s", "hello")           // ERROR "Warnf2 format %#s has unrecognized flag #"
  	f.Wrap(0, "%s", "hello", 3)           // ERROR "Wrap call has possible formatting directive %s"
  	f.Wrapf(0, "%s", "hello", 3)          // ERROR "Wrapf call needs 1 arg but has 2 args"
  	f.Wrapf(0, "%r", "hello")             // ERROR "Wrapf format %r has unknown verb r"
  	f.Wrapf(0, "%#s", "hello")            // ERROR "Wrapf format %#s has unrecognized flag #"
  	f.Wrap2(0, "%s", "hello", 3)          // ERROR "Wrap2 call has possible formatting directive %s"
  	f.Wrapf2(0, "%s", "hello", 3)         // ERROR "Wrapf2 call needs 1 arg but has 2 args"
  	f.Wrapf2(0, "%r", "hello")            // ERROR "Wrapf2 format %r has unknown verb r"
  	f.Wrapf2(0, "%#s", "hello")           // ERROR "Wrapf2 format %#s has unrecognized flag #"
  	fmt.Printf("%#s", FormatterVal(true)) // correct (the type is responsible for formatting)
  	Printf("d%", 2)                       // ERROR "Printf format % is missing verb at end of string"
  	Printf("%d", percentDV)
  	Printf("%d", &percentDV)
  	Printf("%d", notPercentDV)  // ERROR "Printf format %d has arg notPercentDV of wrong type testdata.notPercentDStruct"
  	Printf("%d", &notPercentDV) // ERROR "Printf format %d has arg &notPercentDV of wrong type \*testdata.notPercentDStruct"
  	Printf("%p", &notPercentDV) // Works regardless: we print it as a pointer.
  	Printf("%q", &percentDV)    // ERROR "Printf format %q has arg &percentDV of wrong type \*testdata.percentDStruct"
  	Printf("%s", percentSV)
  	Printf("%s", &percentSV)
  	// Good argument reorderings.
  	Printf("%[1]d", 3)
  	Printf("%[1]*d", 3, 1)
  	Printf("%[2]*[1]d", 1, 3)
  	Printf("%[2]*.[1]*[3]d", 2, 3, 4)
  	fmt.Fprintf(os.Stderr, "%[2]*.[1]*[3]d", 2, 3, 4) // Use Fprintf to make sure we count arguments correctly.
  	// Bad argument reorderings.
  	Printf("%[xd", 3)                      // ERROR "Printf format %\[xd is missing closing \]"
  	Printf("%[x]d x", 3)                   // ERROR "Printf format has invalid argument index \[x\]"
  	Printf("%[3]*s x", "hi", 2)            // ERROR "Printf format has invalid argument index \[3\]"
  	_ = fmt.Sprintf("%[3]d x", 2)          // ERROR "Sprintf format has invalid argument index \[3\]"
  	Printf("%[2]*.[1]*[3]d x", 2, "hi", 4) // ERROR "Printf format %\[2]\*\.\[1\]\*\[3\]d uses non-int \x22hi\x22 as argument of \*"
  	Printf("%[0]s x", "arg1")              // ERROR "Printf format has invalid argument index \[0\]"
  	Printf("%[0]d x", 1)                   // ERROR "Printf format has invalid argument index \[0\]"
  	// Something that satisfies the error interface.
  	var e error
  	fmt.Println(e.Error()) // ok
  	// Something that looks like an error interface but isn't, such as the (*T).Error method
  	// in the testing package.
  	var et1 *testing.T
  	et1.Error()        // ok
  	et1.Error("hi")    // ok
  	et1.Error("%d", 3) // ERROR "Error call has possible formatting directive %d"
  	var et3 errorTest3
  	et3.Error() // ok, not an error method.
  	var et4 errorTest4
  	et4.Error() // ok, not an error method.
  	var et5 errorTest5
  	et5.error() // ok, not an error method.
  	// Interfaces can be used with any verb.
  	var iface interface {
  		ToTheMadness() bool // Method ToTheMadness usually returns false
  	}
  	fmt.Printf("%f", iface) // ok: fmt treats interfaces as transparent and iface may well have a float concrete type
  	// Can't print a function.
  	Printf("%d", someFunction) // ERROR "Printf format %d arg someFunction is a func value, not called"
  	Printf("%v", someFunction) // ERROR "Printf format %v arg someFunction is a func value, not called"
  	Println(someFunction)      // ERROR "Println arg someFunction is a func value, not called"
  	Printf("%p", someFunction) // ok: maybe someone wants to see the pointer
  	Printf("%T", someFunction) // ok: maybe someone wants to see the type
  	// Bug: used to recur forever.
  	Printf("%p %x", recursiveStructV, recursiveStructV.next)
  	Printf("%p %x", recursiveStruct1V, recursiveStruct1V.next)
  	Printf("%p %x", recursiveSliceV, recursiveSliceV)
  	Printf("%p %x", recursiveMapV, recursiveMapV)
  	// Special handling for Log.
  	math.Log(3) // OK
  	var t *testing.T
  	t.Log("%d", 3) // ERROR "Log call has possible formatting directive %d"
  	t.Logf("%d", 3)
  	t.Logf("%d", "hi") // ERROR "Logf format %d has arg \x22hi\x22 of wrong type string"
  
  	// Errorf(1, "%d", 3)    // OK
  	// Errorf(1, "%d", "hi") // no error "Errorf format %d has arg \x22hi\x22 of wrong type string"
  
  	// Multiple string arguments before variadic args
  	// errorf("WARNING", "foobar")            // OK
  	// errorf("INFO", "s=%s, n=%d", "foo", 1) // OK
  	// errorf("ERROR", "%d")                  // no error "errorf format %d reads arg #1, but call has 0 args"
  
  	// Printf from external package
  	// externalprintf.Printf("%d", 42) // OK
  	// externalprintf.Printf("foobar") // OK
  	// level := 123
  	// externalprintf.Logf(level, "%d", 42)                        // OK
  	// externalprintf.Errorf(level, level, "foo %q bar", "foobar") // OK
  	// externalprintf.Logf(level, "%d")                            // no error "Logf format %d reads arg #1, but call has 0 args"
  	// var formatStr = "%s %s"
  	// externalprintf.Sprintf(formatStr, "a", "b")     // OK
  	// externalprintf.Logf(level, formatStr, "a", "b") // OK
  
  	// user-defined Println-like functions
  	ss := &someStruct{}
  	ss.Log(someFunction, "foo")          // OK
  	ss.Error(someFunction, someFunction) // OK
  	ss.Println()                         // OK
  	ss.Println(1.234, "foo")             // OK
  	ss.Println(1, someFunction)          // no error "Println arg someFunction is a func value, not called"
  	ss.log(someFunction)                 // OK
  	ss.log(someFunction, "bar", 1.33)    // OK
  	ss.log(someFunction, someFunction)   // no error "log arg someFunction is a func value, not called"
  
  	// indexed arguments
  	Printf("%d %[3]d %d %[2]d x", 1, 2, 3, 4)             // OK
  	Printf("%d %[0]d %d %[2]d x", 1, 2, 3, 4)             // ERROR "Printf format has invalid argument index \[0\]"
  	Printf("%d %[3]d %d %[-2]d x", 1, 2, 3, 4)            // ERROR "Printf format has invalid argument index \[-2\]"
  	Printf("%d %[3]d %d %[2234234234234]d x", 1, 2, 3, 4) // ERROR "Printf format has invalid argument index \[2234234234234\]"
  	Printf("%d %[3]d %-10d %[2]d x", 1, 2, 3)             // ERROR "Printf format %-10d reads arg #4, but call has 3 args"
  	Printf("%[1][3]d x", 1, 2)                            // ERROR "Printf format %\[1\]\[ has unknown verb \["
  	Printf("%[1]d x", 1, 2)                               // OK
  	Printf("%d %[3]d %d %[2]d x", 1, 2, 3, 4, 5)          // OK
  
  	// wrote Println but meant Fprintln
  	Printf("%p\n", os.Stdout)   // OK
  	Println(os.Stdout, "hello") // ERROR "Println does not take io.Writer but has first arg os.Stdout"
  
  	Printf(someString(), "hello") // OK
  
  	// Printf wrappers in package log should be detected automatically
  	logpkg.Fatal("%d", 1)    // ERROR "Fatal call has possible formatting directive %d"
  	logpkg.Fatalf("%d", "x") // ERROR "Fatalf format %d has arg \x22x\x22 of wrong type string"
  	logpkg.Fatalln("%d", 1)  // ERROR "Fatalln call has possible formatting directive %d"
  	logpkg.Panic("%d", 1)    // ERROR "Panic call has possible formatting directive %d"
  	logpkg.Panicf("%d", "x") // ERROR "Panicf format %d has arg \x22x\x22 of wrong type string"
  	logpkg.Panicln("%d", 1)  // ERROR "Panicln call has possible formatting directive %d"
  	logpkg.Print("%d", 1)    // ERROR "Print call has possible formatting directive %d"
  	logpkg.Printf("%d", "x") // ERROR "Printf format %d has arg \x22x\x22 of wrong type string"
  	logpkg.Println("%d", 1)  // ERROR "Println call has possible formatting directive %d"
  
  	// Methods too.
  	var l *logpkg.Logger
  	l.Fatal("%d", 1)    // ERROR "Fatal call has possible formatting directive %d"
  	l.Fatalf("%d", "x") // ERROR "Fatalf format %d has arg \x22x\x22 of wrong type string"
  	l.Fatalln("%d", 1)  // ERROR "Fatalln call has possible formatting directive %d"
  	l.Panic("%d", 1)    // ERROR "Panic call has possible formatting directive %d"
  	l.Panicf("%d", "x") // ERROR "Panicf format %d has arg \x22x\x22 of wrong type string"
  	l.Panicln("%d", 1)  // ERROR "Panicln call has possible formatting directive %d"
  	l.Print("%d", 1)    // ERROR "Print call has possible formatting directive %d"
  	l.Printf("%d", "x") // ERROR "Printf format %d has arg \x22x\x22 of wrong type string"
  	l.Println("%d", 1)  // ERROR "Println call has possible formatting directive %d"
  
  	// Issue 26486
  	dbg("", 1) // no error "call has arguments but no formatting directive"
  }
  
  func someString() string { return "X" }
  
  type someStruct struct{}
  
  // Log is non-variadic user-define Println-like function.
  // Calls to this func must be skipped when checking
  // for Println-like arguments.
  func (ss *someStruct) Log(f func(), s string) {}
  
  // Error is variadic user-define Println-like function.
  // Calls to this func mustn't be checked for Println-like arguments,
  // since variadic arguments type isn't interface{}.
  func (ss *someStruct) Error(args ...func()) {}
  
  // Println is variadic user-defined Println-like function.
  // Calls to this func must be checked for Println-like arguments.
  func (ss *someStruct) Println(args ...interface{}) {}
  
  // log is variadic user-defined Println-like function.
  // Calls to this func must be checked for Println-like arguments.
  func (ss *someStruct) log(f func(), args ...interface{}) {}
  
  // A function we use as a function value; it has no other purpose.
  func someFunction() {}
  
  /*
  // Printf is used by the test so we must declare it.
  func Printf(format string, args ...interface{}) {
  	panic("don't call - testing only")
  }
  
  // Println is used by the test so we must declare it.
  func Println(args ...interface{}) {
  	panic("don't call - testing only")
  }
  
  // Logf is used by the test so we must declare it.
  func Logf(format string, args ...interface{}) {
  	panic("don't call - testing only")
  }
  
  // Log is used by the test so we must declare it.
  func Log(args ...interface{}) {
  	panic("don't call - testing only")
  }
  */
  
  // printf is used by the test so we must declare it.
  func printf(format string, args ...interface{}) {
  	panic("don't call - testing only")
  }
  
  /*
  // Errorf is used by the test for a case in which the first parameter
  // is not a format string.
  func Errorf(i int, format string, args ...interface{}) {
  	panic("don't call - testing only")
  }
  
  // errorf is used by the test for a case in which the function accepts multiple
  // string parameters before variadic arguments
  func errorf(level, format string, args ...interface{}) {
  	panic("don't call - testing only")
  }
  */
  
  // multi is used by the test.
  func multi() []interface{} {
  	panic("don't call - testing only")
  }
  
  type stringer int
  
  func (stringer) String() string { return "string" }
  
  type ptrStringer float64
  
  var stringerv ptrStringer
  
  func (*ptrStringer) String() string {
  	return "string"
  }
  
  func (p *ptrStringer) Warn2(x int, args ...interface{}) string {
  	return p.Warn(x, args...)
  }
  
  func (p *ptrStringer) Warnf2(x int, format string, args ...interface{}) string {
  	return p.Warnf(x, format, args...)
  }
  
  func (*ptrStringer) Warn(x int, args ...interface{}) string {
  	return "warn"
  }
  
  func (*ptrStringer) Warnf(x int, format string, args ...interface{}) string {
  	return "warnf"
  }
  
  func (p *ptrStringer) Wrap2(x int, args ...interface{}) string {
  	return p.Wrap(x, args...)
  }
  
  func (p *ptrStringer) Wrapf2(x int, format string, args ...interface{}) string {
  	return p.Wrapf(x, format, args...)
  }
  
  func (*ptrStringer) Wrap(x int, args ...interface{}) string {
  	return fmt.Sprint(args...)
  }
  
  func (*ptrStringer) Wrapf(x int, format string, args ...interface{}) string {
  	return fmt.Sprintf(format, args...)
  }
  
  func (*ptrStringer) BadWrap(x int, args ...interface{}) string {
  	return fmt.Sprint(args) // ERROR "missing ... in args forwarded to print-like function"
  }
  
  func (*ptrStringer) BadWrapf(x int, format string, args ...interface{}) string {
  	return fmt.Sprintf(format, args) // ERROR "missing ... in args forwarded to printf-like function"
  }
  
  func (*ptrStringer) WrapfFalsePositive(x int, arg1 string, arg2 ...interface{}) string {
  	return fmt.Sprintf("%s %v", arg1, arg2)
  }
  
  type embeddedStringer struct {
  	foo string
  	ptrStringer
  	bar int
  }
  
  var embeddedStringerv embeddedStringer
  
  type notstringer struct {
  	f float64
  }
  
  var notstringerv notstringer
  
  type stringerarray [4]float64
  
  func (stringerarray) String() string {
  	return "string"
  }
  
  var stringerarrayv stringerarray
  
  type notstringerarray [4]float64
  
  var notstringerarrayv notstringerarray
  
  var nonemptyinterface = interface {
  	f()
  }(nil)
  
  // A data type we can print with "%d".
  type percentDStruct struct {
  	a int
  	b []byte
  	c *float64
  }
  
  var percentDV percentDStruct
  
  // A data type we cannot print correctly with "%d".
  type notPercentDStruct struct {
  	a int
  	b []byte
  	c bool
  }
  
  var notPercentDV notPercentDStruct
  
  // A data type we can print with "%s".
  type percentSStruct struct {
  	a string
  	b []byte
  	C stringerarray
  }
  
  var percentSV percentSStruct
  
  type recursiveStringer int
  
  func (s recursiveStringer) String() string {
  	_ = fmt.Sprintf("%d", s)
  	_ = fmt.Sprintf("%#v", s)
  	_ = fmt.Sprintf("%v", s)  // ERROR "Sprintf format %v with arg s causes recursive String method call"
  	_ = fmt.Sprintf("%v", &s) // ERROR "Sprintf format %v with arg &s causes recursive String method call"
  	_ = fmt.Sprintf("%T", s)  // ok; does not recursively call String
  	return fmt.Sprintln(s)    // ERROR "Sprintln arg s causes recursive call to String method"
  }
  
  type recursivePtrStringer int
  
  func (p *recursivePtrStringer) String() string {
  	_ = fmt.Sprintf("%v", *p)
  	_ = fmt.Sprint(&p)     // ok; prints address
  	return fmt.Sprintln(p) // ERROR "Sprintln arg p causes recursive call to String method"
  }
  
  type BoolFormatter bool
  
  func (*BoolFormatter) Format(fmt.State, rune) {
  }
  
  // Formatter with value receiver
  type FormatterVal bool
  
  func (FormatterVal) Format(fmt.State, rune) {
  }
  
  type RecursiveSlice []RecursiveSlice
  
  var recursiveSliceV = &RecursiveSlice{}
  
  type RecursiveMap map[int]RecursiveMap
  
  var recursiveMapV = make(RecursiveMap)
  
  type RecursiveStruct struct {
  	next *RecursiveStruct
  }
  
  var recursiveStructV = &RecursiveStruct{}
  
  type RecursiveStruct1 struct {
  	next *RecursiveStruct2
  }
  
  type RecursiveStruct2 struct {
  	next *RecursiveStruct1
  }
  
  var recursiveStruct1V = &RecursiveStruct1{}
  
  type unexportedInterface struct {
  	f interface{}
  }
  
  // Issue 17798: unexported ptrStringer cannot be formatted.
  type unexportedStringer struct {
  	t ptrStringer
  }
  type unexportedStringerOtherFields struct {
  	s string
  	t ptrStringer
  	S string
  }
  
  // Issue 17798: unexported error cannot be formatted.
  type unexportedError struct {
  	e error
  }
  type unexportedErrorOtherFields struct {
  	s string
  	e error
  	S string
  }
  
  type errorer struct{}
  
  func (e errorer) Error() string { return "errorer" }
  
  type unexportedCustomError struct {
  	e errorer
  }
  
  type errorInterface interface {
  	error
  	ExtraMethod()
  }
  
  type unexportedErrorInterface struct {
  	e errorInterface
  }
  
  func UnexportedStringerOrError() {
  	fmt.Printf("%s", unexportedInterface{"foo"}) // ok; prints {foo}
  	fmt.Printf("%s", unexportedInterface{3})     // ok; we can't see the problem
  
  	us := unexportedStringer{}
  	fmt.Printf("%s", us)  // ERROR "Printf format %s has arg us of wrong type testdata.unexportedStringer"
  	fmt.Printf("%s", &us) // ERROR "Printf format %s has arg &us of wrong type [*]testdata.unexportedStringer"
  
  	usf := unexportedStringerOtherFields{
  		s: "foo",
  		S: "bar",
  	}
  	fmt.Printf("%s", usf)  // ERROR "Printf format %s has arg usf of wrong type testdata.unexportedStringerOtherFields"
  	fmt.Printf("%s", &usf) // ERROR "Printf format %s has arg &usf of wrong type [*]testdata.unexportedStringerOtherFields"
  
  	ue := unexportedError{
  		e: &errorer{},
  	}
  	fmt.Printf("%s", ue)  // ERROR "Printf format %s has arg ue of wrong type testdata.unexportedError"
  	fmt.Printf("%s", &ue) // ERROR "Printf format %s has arg &ue of wrong type [*]testdata.unexportedError"
  
  	uef := unexportedErrorOtherFields{
  		s: "foo",
  		e: &errorer{},
  		S: "bar",
  	}
  	fmt.Printf("%s", uef)  // ERROR "Printf format %s has arg uef of wrong type testdata.unexportedErrorOtherFields"
  	fmt.Printf("%s", &uef) // ERROR "Printf format %s has arg &uef of wrong type [*]testdata.unexportedErrorOtherFields"
  
  	uce := unexportedCustomError{
  		e: errorer{},
  	}
  	fmt.Printf("%s", uce) // ERROR "Printf format %s has arg uce of wrong type testdata.unexportedCustomError"
  
  	uei := unexportedErrorInterface{}
  	fmt.Printf("%s", uei)       // ERROR "Printf format %s has arg uei of wrong type testdata.unexportedErrorInterface"
  	fmt.Println("foo\n", "bar") // not an error
  
  	fmt.Println("foo\n")  // ERROR "Println arg list ends with redundant newline"
  	fmt.Println("foo\\n") // not an error
  	fmt.Println(`foo\n`)  // not an error
  
  	intSlice := []int{3, 4}
  	fmt.Printf("%s", intSlice) // ERROR "Printf format %s has arg intSlice of wrong type \[\]int"
  	nonStringerArray := [1]unexportedStringer{{}}
  	fmt.Printf("%s", nonStringerArray)  // ERROR "Printf format %s has arg nonStringerArray of wrong type \[1\]testdata.unexportedStringer"
  	fmt.Printf("%s", []stringer{3, 4})  // not an error
  	fmt.Printf("%s", [2]stringer{3, 4}) // not an error
  }
  
  // TODO: Disable complaint about '0' for Go 1.10. To be fixed properly in 1.11.
  // See issues 23598 and 23605.
  func DisableErrorForFlag0() {
  	fmt.Printf("%0t", true)
  }
  
  // Issue 26486.
  func dbg(format string, args ...interface{}) {
  	if format == "" {
  		format = "%v"
  	}
  	fmt.Printf(format, args...)
  }
  

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