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Diffstat (limited to 'src/internal/types/testdata/fixedbugs/issue6977.go')
-rw-r--r-- | src/internal/types/testdata/fixedbugs/issue6977.go | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/src/internal/types/testdata/fixedbugs/issue6977.go b/src/internal/types/testdata/fixedbugs/issue6977.go new file mode 100644 index 0000000..8f4e9ba --- /dev/null +++ b/src/internal/types/testdata/fixedbugs/issue6977.go @@ -0,0 +1,82 @@ +// Copyright 2019 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. + +package p + +import "io" + +// Alan's initial report. + +type I interface { f(); String() string } +type J interface { g(); String() string } + +type IJ1 = interface { I; J } +type IJ2 = interface { f(); g(); String() string } + +var _ = (*IJ1)(nil) == (*IJ2)(nil) // static assert that IJ1 and IJ2 are identical types + +// The canonical example. + +type ReadWriteCloser interface { io.ReadCloser; io.WriteCloser } + +// Some more cases. + +type M interface { m() } +type M32 interface { m() int32 } +type M64 interface { m() int64 } + +type U1 interface { m() } +type U2 interface { m(); M } +type U3 interface { M; m() } +type U4 interface { M; M; M } +type U5 interface { U1; U2; U3; U4 } + +type U6 interface { m(); m /* ERROR duplicate method */ () } +type U7 interface { M32 /* ERROR duplicate method */ ; m() } +type U8 interface { m(); M32 /* ERROR duplicate method */ } +type U9 interface { M32; M64 /* ERROR duplicate method */ } + +// Verify that repeated embedding of the same interface(s) +// eliminates duplicate methods early (rather than at the +// end) to prevent exponential memory and time use. +// Without early elimination, computing T29 may take dozens +// of minutes. +type ( + T0 interface { m() } + T1 interface { T0; T0 } + T2 interface { T1; T1 } + T3 interface { T2; T2 } + T4 interface { T3; T3 } + T5 interface { T4; T4 } + T6 interface { T5; T5 } + T7 interface { T6; T6 } + T8 interface { T7; T7 } + T9 interface { T8; T8 } + + T10 interface { T9; T9 } + T11 interface { T10; T10 } + T12 interface { T11; T11 } + T13 interface { T12; T12 } + T14 interface { T13; T13 } + T15 interface { T14; T14 } + T16 interface { T15; T15 } + T17 interface { T16; T16 } + T18 interface { T17; T17 } + T19 interface { T18; T18 } + + T20 interface { T19; T19 } + T21 interface { T20; T20 } + T22 interface { T21; T21 } + T23 interface { T22; T22 } + T24 interface { T23; T23 } + T25 interface { T24; T24 } + T26 interface { T25; T25 } + T27 interface { T26; T26 } + T28 interface { T27; T27 } + T29 interface { T28; T28 } +) + +// Verify that m is present. +var x T29 +var _ = x.m |