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https://github.com/golang/go
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42 lines
904 B
Go
42 lines
904 B
Go
// errchk $G $D/$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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// Static error messages about interface conversions.
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package main
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type T struct { a int }
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var t *T
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type I interface { M() }
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var i I
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type I2 interface { M(); N(); }
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var i2 I2
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type E interface { }
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var e E
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func main() {
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e = t; // ok
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t = e; // ERROR "need explicit|need type assertion"
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// neither of these can work,
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// because i has an extra method
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// that t does not, so i cannot contain a t.
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i = t; // ERROR "missing|incompatible|is not"
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t = i; // ERROR "missing|incompatible|is not"
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i = i2; // ok
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i2 = i; // ERROR "need explicit|need type assertion"
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i = I(i2); // ok
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i2 = I2(i); // ERROR "need explicit|need type assertion"
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e = E(t); // ok
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t = T(e); // ERROR "need explicit|need type assertion"
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}
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