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cmd/compile/internal/types2: use combined type and ordinary args for type inference
Fixes #44799. Change-Id: I51d5b6d6fdfcf47b87bf40b1f7e31c3284c2813f Reviewed-on: https://go-review.googlesource.com/c/go/+/308372 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
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@ -129,7 +129,7 @@ func (check *Checker) builtin(x *operand, call *syntax.CallExpr, id builtinId) (
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arg(&x, i)
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xlist = append(xlist, &x)
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}
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check.arguments(call, sig, xlist) // discard result (we know the result type)
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check.arguments(call, sig, nil, xlist) // discard result (we know the result type)
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// ok to continue even if check.arguments reported errors
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x.mode = value
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@ -67,9 +67,14 @@ func (check *Checker) funcInst(x *operand, inst *syntax.IndexExpr) {
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}
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func (check *Checker) callExpr(x *operand, call *syntax.CallExpr) exprKind {
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var inst *syntax.IndexExpr // function instantiation, if any
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if iexpr, _ := call.Fun.(*syntax.IndexExpr); iexpr != nil {
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if check.indexExpr(x, iexpr) {
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check.funcInst(x, iexpr)
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// Delay function instantiation to argument checking,
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// where we combine type and value arguments for type
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// inference.
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assert(x.mode == value)
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inst = iexpr
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}
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x.expr = iexpr
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check.record(x)
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@ -137,9 +142,33 @@ func (check *Checker) callExpr(x *operand, call *syntax.CallExpr) exprKind {
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return statement
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}
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// evaluate type arguments, if any
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var targs []Type
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if inst != nil {
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xlist := unpackExpr(inst.Index)
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targs = check.typeList(xlist)
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if targs == nil {
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check.use(call.ArgList...)
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x.mode = invalid
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x.expr = call
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return statement
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}
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assert(len(targs) == len(xlist))
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// check number of type arguments (got) vs number of type parameters (want)
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got, want := len(targs), len(sig.tparams)
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if got > want {
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check.errorf(xlist[want], "got %d type arguments but want %d", got, want)
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check.use(call.ArgList...)
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x.mode = invalid
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x.expr = call
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return statement
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}
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}
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// evaluate arguments
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args, _ := check.exprList(call.ArgList, false)
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sig = check.arguments(call, sig, args)
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sig = check.arguments(call, sig, targs, args)
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// determine result
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switch sig.results.Len() {
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@ -208,7 +237,7 @@ func (check *Checker) exprList(elist []syntax.Expr, allowCommaOk bool) (xlist []
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return
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}
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func (check *Checker) arguments(call *syntax.CallExpr, sig *Signature, args []*operand) (rsig *Signature) {
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func (check *Checker) arguments(call *syntax.CallExpr, sig *Signature, targs []Type, args []*operand) (rsig *Signature) {
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rsig = sig
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// TODO(gri) try to eliminate this extra verification loop
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@ -292,7 +321,7 @@ func (check *Checker) arguments(call *syntax.CallExpr, sig *Signature, args []*o
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if len(sig.tparams) > 0 {
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// TODO(gri) provide position information for targs so we can feed
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// it to the instantiate call for better error reporting
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targs := check.infer(call.Pos(), sig.tparams, nil, sigParams, args, true)
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targs = check.infer(call.Pos(), sig.tparams, targs, sigParams, args, true)
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if targs == nil {
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return // error already reported
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}
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@ -1,4 +1,3 @@
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// UNREVIEWED
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// Copyright 2020 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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@ -17,5 +16,8 @@ func f[V interface{}, A, B Box[V]]() {}
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func _() {
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f[int, Optional[int], Optional[int]]()
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f[int, Optional[int], Optional /* ERROR does not satisfy Box */ [string]]()
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_ = f[int, Optional[int], Optional /* ERROR does not satisfy Box */ [string]]
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// TODO(gri) Provide better position information here.
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// See TODO in call.go, Checker.arguments.
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f[int, Optional[int], Optional[string]]( /* ERROR does not satisfy Box */ )
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}
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19
src/cmd/compile/internal/types2/fixedbugs/issue44799.go2
Normal file
19
src/cmd/compile/internal/types2/fixedbugs/issue44799.go2
Normal file
@ -0,0 +1,19 @@
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// Copyright 2021 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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func Map[F, T any](s []F, f func(F) T) []T { return nil }
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func Reduce[Elem1, Elem2 any](s []Elem1, initializer Elem2, f func(Elem2, Elem1) Elem2) Elem2 { var x Elem2; return x }
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func main() {
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var s []int
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var f1 func(int) float64
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var f2 func(float64, int) float64
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_ = Map[int](s, f1)
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_ = Map(s, f1)
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_ = Reduce[int](s, 0, f2)
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_ = Reduce(s, 0, f2)
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}
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