Home | History | Annotate | Download | only in testdata 
      1 // Copyright 2012 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 // conversions
      6 
      7 package conversions
      8 
      9 import "unsafe"
     10 
     11 // argument count
     12 var (
     13 	_ = int() /* ERROR "missing argument" */
     14 	_ = int(1, 2 /* ERROR "too many arguments" */ )
     15 )
     16 
     17 // numeric constant conversions are in const1.src.
     18 
     19 func string_conversions() {
     20 	const A = string(65)
     21 	assert(A == "A")
     22 	const E = string(-1)
     23 	assert(E == "\uFFFD")
     24 	assert(E == string(1234567890))
     25 
     26 	type myint int
     27 	assert(A == string(myint(65)))
     28 
     29 	type mystring string
     30 	const _ mystring = mystring("foo")
     31 
     32 	const _ = string(true /* ERROR "cannot convert" */ )
     33 	const _ = string(1.2 /* ERROR "cannot convert" */ )
     34 	const _ = string(nil /* ERROR "cannot convert" */ )
     35 
     36 	// issues 11357, 11353: argument must be of integer type
     37 	_ = string(0.0 /* ERROR "cannot convert" */ )
     38 	_ = string(0i /* ERROR "cannot convert" */ )
     39 	_ = string(1 /* ERROR "cannot convert" */ + 2i)
     40 }
     41 
     42 func interface_conversions() {
     43 	type E interface{}
     44 
     45 	type I1 interface{
     46 		m1()
     47 	}
     48 
     49 	type I2 interface{
     50 		m1()
     51 		m2(x int)
     52 	}
     53 
     54 	type I3 interface{
     55 		m1()
     56 		m2() int
     57 	}
     58 
     59 	var e E
     60 	var i1 I1
     61 	var i2 I2
     62 	var i3 I3
     63 
     64 	_ = E(0)
     65 	_ = E(nil)
     66 	_ = E(e)
     67 	_ = E(i1)
     68 	_ = E(i2)
     69 
     70 	_ = I1(0 /* ERROR "cannot convert" */ )
     71 	_ = I1(nil)
     72 	_ = I1(i1)
     73 	_ = I1(e /* ERROR "cannot convert" */ )
     74 	_ = I1(i2)
     75 
     76 	_ = I2(nil)
     77 	_ = I2(i1 /* ERROR "cannot convert" */ )
     78 	_ = I2(i2)
     79 	_ = I2(i3 /* ERROR "cannot convert" */ )
     80 
     81 	_ = I3(nil)
     82 	_ = I3(i1 /* ERROR "cannot convert" */ )
     83 	_ = I3(i2 /* ERROR "cannot convert" */ )
     84 	_ = I3(i3)
     85 
     86 	// TODO(gri) add more tests, improve error message
     87 }
     88 
     89 func issue6326() {
     90 	type T unsafe.Pointer
     91 	var x T
     92 	_ = uintptr(x) // see issue 6326
     93 }
     94