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03d81b5ed9
This CL completes support for alias declarations in the compiler. Also: - increased export format version - updated various comments For #16339. Fixes #17487. Change-Id: Ic6945fc44c0041771eaf9dcfe973f601d14de069 Reviewed-on: https://go-review.googlesource.com/32090 Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com>
97 lines
2.9 KiB
Go
97 lines
2.9 KiB
Go
// errorcheck
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// Copyright 2016 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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// Test basic restrictions on alias declarations.
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package p
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import (
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"fmt" // use at most once (to test "imported but not used" error)
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"go/build"
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. "go/build"
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"io"
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"math"
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"unsafe"
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)
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// helper
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var before struct {
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f
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}
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// aliases must refer to package-qualified identifiers
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// TODO(gri) should only see one error for declaration below - fix this
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const _ => 0 // ERROR "unexpected literal 0|_ is not a package-qualified identifier"
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type _ => _ // ERROR "_ is not a package-qualified identifier"
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type t => _ // ERROR "_ is not a package-qualified identifier"
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const _ => iota // ERROR "iota is not a package-qualified identifier"
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type _ => int // ERROR "int is not a package-qualified identifier"
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const c => iota // ERROR "iota is not a package-qualified identifier"
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type t => int // ERROR "int is not a package-qualified identifier"
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// dot-imported identifiers are not qualified identifiers
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// TODO(gri) fix error printing - should not print a qualified identifier...
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var _ => Default // ERROR "build\.Default is not a package-qualified identifier"
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// qualified identifiers must start with a package
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var _ => before.f // ERROR "before is not a package"
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func _ => before.f // ERROR "before is not a package"
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var _ => after.m // ERROR "after is not a package"
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func _ => after.m // ERROR "after is not a package"
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var v => before.f // ERROR "before is not a package"
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func f => before.f // ERROR "before is not a package"
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var v => after.m // ERROR "after is not a package"
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func f => after.m // ERROR "after is not a package"
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// TODO(gri) fix error printing - should print correct qualified identifier...
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var _ => Default.ARCH // ERROR "build.Default is not a package"
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// aliases may not refer to package unsafe
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type ptr => unsafe.Pointer // ERROR "ptr refers to package unsafe"
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func size => unsafe.Sizeof // ERROR "size refers to package unsafe"
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// aliases must refer to entities of the same kind
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const _ => math.Pi
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const pi => math.Pi
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const pi1 => math.Sin // ERROR "math.Sin is not a constant"
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type _ => io.Writer
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type writer => io.Writer
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type writer1 => math.Sin // ERROR "math.Sin is not a type"
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var _ => build.Default
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var def => build.Default
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var def1 => build.Import // ERROR "build.Import is not a variable"
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func _ => math.Sin
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func sin => math.Sin
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func sin1 => math.Pi // ERROR "math.Pi is not a function"
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// alias reference to a package marks package as used
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func _ => fmt.Println
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// re-exported aliases
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const Pi => math.Pi
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type Writer => io.Writer
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var Def => build.Default
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func Sin => math.Sin
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// type aliases denote identical types
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type myPackage => build.Package
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var pkg myPackage
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var _ build.Package = pkg // valid assignment
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var _ *build.Package = &pkg // valid assignment
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// helper
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type after struct{}
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func (after) m() {}
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