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Source file test/cmplx.go

Documentation: test

  // errorcheck
  
  // 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.
  
  // Verify that incorrect invocations of the complex predeclared function are detected.
  // Does not compile.
  
  package main
  
  type (
  	Float32    float32
  	Float64    float64
  	Complex64  complex64
  	Complex128 complex128
  )
  
  var (
  	f32 float32
  	f64 float64
  	F32 Float32
  	F64 Float64
  
  	c64  complex64
  	c128 complex128
  	C64  Complex64
  	C128 Complex128
  )
  
  func F1() int {
  	return 1
  }
  
  func F3() (int, int, int) {
  	return 1, 2, 3
  }
  
  func main() {
  	// ok
  	c64 = complex(f32, f32)
  	c128 = complex(f64, f64)
  
  	_ = complex128(0)     // ok
  	_ = complex(f32, f64) // ERROR "complex"
  	_ = complex(f64, f32) // ERROR "complex"
  	_ = complex(f32, F32) // ERROR "complex"
  	_ = complex(F32, f32) // ERROR "complex"
  	_ = complex(f64, F64) // ERROR "complex"
  	_ = complex(F64, f64) // ERROR "complex"
  
  	_ = complex(F1()) // ERROR "expects two arguments.*returns 1"
  	_ = complex(F3()) // ERROR "expects two arguments.*returns 3"
  
  	_ = complex() // ERROR "missing argument"
  
  	c128 = complex(f32, f32) // ERROR "cannot use"
  	c64 = complex(f64, f64)  // ERROR "cannot use"
  
  	c64 = complex(1.0, 2.0) // ok, constant is untyped
  	c128 = complex(1.0, 2.0)
  	C64 = complex(1.0, 2.0)
  	C128 = complex(1.0, 2.0)
  
  	C64 = complex(f32, f32)  // ERROR "cannot use"
  	C128 = complex(f64, f64) // ERROR "cannot use"
  
  }
  

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