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go/test/typeparam/smoketest.go
Matthew Dempsky c9912780ab cmd/compile: enable -G=3 by default
This CL changes cmd/compile's -G flag's default from 0 to 3, which
enables use of the new types2 type checker and support for type
parameters. The old type checker is still available with
-gcflags=all=-G=0.

The CL also updates the regress test harness to account for the change
in default behavior (e.g., to expect known types2 changes/failures).
However, the -G=0 mode is still being tested for now.

Copy of CL 340914 by danscales@, minus the cmd/internal/objabi.AbsFile
change (handled instead by CL 343731) and rebased to master branch.

Updates #43651.

Change-Id: I1f62d6c0a3ff245e15c5c0e8f3d922129fdd4f29
Reviewed-on: https://go-review.googlesource.com/c/go/+/343732
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2021-08-21 00:24:02 +00:00

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Go

// compile -G=1
// Copyright 2020 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.
// This file checks simple code using type parameters.
package smoketest
// type parameters for functions
func f1[P any]() {}
func f2[P1, P2 any, P3 any]() {}
func f3[P interface{}](x P, y T1[int]) {}
// function instantiations
var _ = f1[int]
var _ = f2[int, string, struct{}]
var _ = f3[bool]
// type parameters for types
type T1[P any] struct{}
type T2[P1, P2 any, P3 any] struct{}
type T3[P interface{}] interface{}
// type instantiations
type _ T1[int]
type _ T2[int, string, struct{}]
type _ T3[bool]
// methods
func (T1[P]) m1() {}
func (T1[_]) m2() {}
func (x T2[P1, P2, P3]) m() {}
// type lists
type _ interface {
m1()
m2()
int | float32 | string
m3()
}
// embedded instantiated types
type _ struct {
f1, f2 int
T1[int]
T2[int, string, struct{}]
T3[bool]
}
type _ interface {
m1()
m2()
T3[bool]
}