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go/types: remove the report parameter from infer and inferB

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The report parameter is now always true, so we can simplify these
functions.

Change-Id: I851adad3011beef9c83172210ff5e93c624372cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/350049
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Robert Findley 2021-09-14 22:09:54 -04:00
parent 6097ebe627
commit fdf2053d52
2 changed files with 9 additions and 18 deletions
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4
src/go/types/call.go
View File

@ -40,7 +40,7 @@ func (check *Checker) funcInst(x *operand, ix *typeparams.IndexExpr) {
}
if got < want {
targs = check.infer(ix.Orig, sig.TypeParams().list(), targs, nil, nil, true)
targs = check.infer(ix.Orig, sig.TypeParams().list(), targs, nil, nil)
if targs == nil {
// error was already reported
x.mode = invalid
@ -340,7 +340,7 @@ func (check *Checker) arguments(call *ast.CallExpr, sig *Signature, targs []Type
}
// TODO(gri) provide position information for targs so we can feed
// it to the instantiate call for better error reporting
targs := check.infer(call, sig.TypeParams().list(), targs, sigParams, args, true)
targs := check.infer(call, sig.TypeParams().list(), targs, sigParams, args)
if targs == nil {
return // error already reported
}

23
src/go/types/infer.go
View File

@ -27,9 +27,7 @@ import (
// 3) Infer type arguments from untyped function arguments.
//
// Constraint type inference is used after each step to expand the set of type arguments.
//
// TODO(rfindley): remove the report parameter: is no longer needed.
func (check *Checker) infer(posn positioner, tparams []*TypeParam, targs []Type, params *Tuple, args []*operand, report bool) (result []Type) {
func (check *Checker) infer(posn positioner, tparams []*TypeParam, targs []Type, params *Tuple, args []*operand) (result []Type) {
if debug {
defer func() {
assert(result == nil || len(result) == len(tparams))
@ -61,7 +59,7 @@ func (check *Checker) infer(posn positioner, tparams []*TypeParam, targs []Type,
// If we have type arguments, see how far we get with constraint type inference.
if len(targs) > 0 {
var index int
targs, index = check.inferB(tparams, targs, report)
targs, index = check.inferB(tparams, targs)
if targs == nil || index < 0 {
return targs
}
@ -106,9 +104,6 @@ func (check *Checker) infer(posn positioner, tparams []*TypeParam, targs []Type,
}
errorf := func(kind string, tpar, targ Type, arg *operand) {
if !report {
return
}
// provide a better error message if we can
targs, index := u.x.types()
if index == 0 {
@ -175,7 +170,7 @@ func (check *Checker) infer(posn positioner, tparams []*TypeParam, targs []Type,
// See how far we get with constraint type inference.
// Note that even if we don't have any type arguments, constraint type inference
// may produce results for constraints that explicitly specify a type.
targs, index = check.inferB(tparams, targs, report)
targs, index = check.inferB(tparams, targs)
if targs == nil || index < 0 {
return targs
}
@ -211,7 +206,7 @@ func (check *Checker) infer(posn positioner, tparams []*TypeParam, targs []Type,
}
// Again, follow up with constraint type inference.
targs, index = check.inferB(tparams, targs, report)
targs, index = check.inferB(tparams, targs)
if targs == nil || index < 0 {
return targs
}
@ -219,9 +214,7 @@ func (check *Checker) infer(posn positioner, tparams []*TypeParam, targs []Type,
// At least one type argument couldn't be inferred.
assert(index >= 0 && targs[index] == nil)
tpar := tparams[index]
if report {
check.errorf(posn, _Todo, "cannot infer %s (%v) (%v)", tpar.obj.name, tpar.obj.pos, targs)
}
check.errorf(posn, _Todo, "cannot infer %s (%v) (%v)", tpar.obj.name, tpar.obj.pos, targs)
return nil
}
@ -362,7 +355,7 @@ func (w *tpWalker) isParameterizedTypeList(list []Type) bool {
// first type argument in that list that couldn't be inferred (and thus is nil). If all
// type arguments were inferred successfully, index is < 0. The number of type arguments
// provided may be less than the number of type parameters, but there must be at least one.
func (check *Checker) inferB(tparams []*TypeParam, targs []Type, report bool) (types []Type, index int) {
func (check *Checker) inferB(tparams []*TypeParam, targs []Type) (types []Type, index int) {
assert(len(tparams) >= len(targs) && len(targs) > 0)
// Setup bidirectional unification between those structural bounds
@ -384,9 +377,7 @@ func (check *Checker) inferB(tparams []*TypeParam, targs []Type, report bool) (t
sbound := typ.structuralType()
if sbound != nil {
if !u.unify(typ, sbound) {
if report {
check.errorf(tpar.obj, _Todo, "%s does not match %s", tpar.obj, sbound)
}
check.errorf(tpar.obj, _Todo, "%s does not match %s", tpar.obj, sbound)
return nil, 0
}
}