github.com/miolini/go@v0.0.0-20160405192216-fca68c8cb408/test/cmplx.go (about)

     1  // errorcheck
     2  
     3  // Copyright 2010 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // Verify that incorrect invocations of the complex predeclared function are detected.
     8  // Does not compile.
     9  
    10  package main
    11  
    12  type (
    13  	Float32    float32
    14  	Float64    float64
    15  	Complex64  complex64
    16  	Complex128 complex128
    17  )
    18  
    19  var (
    20  	f32 float32
    21  	f64 float64
    22  	F32 Float32
    23  	F64 Float64
    24  
    25  	c64  complex64
    26  	c128 complex128
    27  	C64  Complex64
    28  	C128 Complex128
    29  )
    30  
    31  func main() {
    32  	// ok
    33  	c64 = complex(f32, f32)
    34  	c128 = complex(f64, f64)
    35  
    36  	_ = complex128(0)     // ok
    37  	_ = complex(f32, f64) // ERROR "complex"
    38  	_ = complex(f64, f32) // ERROR "complex"
    39  	_ = complex(f32, F32) // ERROR "complex"
    40  	_ = complex(F32, f32) // ERROR "complex"
    41  	_ = complex(f64, F64) // ERROR "complex"
    42  	_ = complex(F64, f64) // ERROR "complex"
    43  
    44  	c128 = complex(f32, f32) // ERROR "cannot use"
    45  	c64 = complex(f64, f64)  // ERROR "cannot use"
    46  
    47  	c64 = complex(1.0, 2.0) // ok, constant is untyped
    48  	c128 = complex(1.0, 2.0)
    49  	C64 = complex(1.0, 2.0)
    50  	C128 = complex(1.0, 2.0)
    51  
    52  	C64 = complex(f32, f32)  // ERROR "cannot use"
    53  	C128 = complex(f64, f64) // ERROR "cannot use"
    54  }