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https://github.com/golang/go
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65 lines
2.0 KiB
Go
65 lines
2.0 KiB
Go
// errchk $G -e $D/$F.go
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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// explicit conversion of constants is work in progress.
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// the ERRORs in this block are debatable, but they're what
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// the language spec says for now.
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var x1 = string(1);
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var x2 string = string(1);
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var x3 = int(1.5); // ERROR "convert|truncate"
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var x4 int = int(1.5); // ERROR "convert|truncate"
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var x5 = "a" + string(1);
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var x6 = int(1e100); // ERROR "overflow"
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var x7 = float(1e1000); // ERROR "overflow"
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// implicit conversions merit scrutiny
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var s string;
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var bad1 string = 1; // ERROR "conver|incompatible|invalid|cannot"
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var bad2 = s + 1; // ERROR "conver|incompatible|invalid"
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var bad3 = s + 'a'; // ERROR "conver|incompatible|invalid"
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var bad4 = "a" + 1; // ERROR "literals|incompatible|convert|invalid"
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var bad5 = "a" + 'a'; // ERROR "literals|incompatible|convert|invalid"
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var bad6 int = 1.5; // ERROR "convert|truncate"
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var bad7 int = 1e100; // ERROR "overflow"
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var bad8 float32 = 1e200; // ERROR "overflow"
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// but these implicit conversions are okay
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var good1 string = "a";
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var good2 int = 1.0;
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var good3 int = 1e9;
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var good4 float = 1e20;
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// explicit conversion of string is okay
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var _ = []int("abc")
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var _ = []byte("abc")
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// implicit is not
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var _ []int = "abc" // ERROR "cannot use|incompatible|invalid"
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var _ []byte = "abc" // ERROR "cannot use|incompatible|invalid"
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// named string is okay
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type Tstring string
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var ss Tstring = "abc"
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var _ = []int(ss)
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var _ = []byte(ss)
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// implicit is still not
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var _ []int = ss // ERROR "cannot use|incompatible|invalid"
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var _ []byte = ss // ERROR "cannot use|incompatible|invalid"
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// named slice is not
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type Tint []int
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type Tbyte []byte
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var _ = Tint("abc") // ERROR "convert|incompatible|invalid"
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var _ = Tbyte("abc") // ERROR "convert|incompatible|invalid"
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// implicit is still not
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var _ Tint = "abc" // ERROR "cannot use|incompatible|invalid"
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var _ Tbyte = "abc" // ERROR "cannot use|incompatible|invalid"
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