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go/types: combine two loops (cleanup of TODO)

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This is an exact port of CL 307949 to go/types.

Change-Id: I796f3030a86d76deb80e58bb547460b586480911
Reviewed-on: https://go-review.googlesource.com/c/go/+/312096
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:
Rob Findley 2021-04-20 23:10:09 -04:00 committed by Robert Findley
parent 5daefc5363
commit f0a8101d34
1 changed files with 11 additions and 21 deletions
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32
src/go/types/infer.go
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@ -182,33 +182,23 @@ func (check *Checker) infer(posn positioner, tparams []*TypeName, targs []Type,
// Use any untyped arguments to infer additional type arguments.
// Some generic parameters with untyped arguments may have been given
// a type by now, we can ignore them.
j := 0
for _, i := range indices {
par := params.At(i)
// Since untyped types are all basic (i.e., non-composite) types, an
// untyped argument will never match a composite parameter type; the
// only parameter type it can possibly match against is a *TypeParam.
// Thus, only keep the indices of generic parameters that are not of
// composite types and which don't have a type inferred yet.
// Thus, only consider untyped arguments for generic parameters that
// are not of composite types and which don't have a type inferred yet.
if tpar, _ := par.typ.(*_TypeParam); tpar != nil && targs[tpar.index] == nil {
indices[j] = i
j++
}
}
indices = indices[:j]
// Unify parameter and default argument types for remaining generic parameters.
// TODO(gri) Rather than iterating again, combine this code with the loop above.
for _, i := range indices {
par := params.At(i)
arg := args[i]
targ := Default(arg.typ)
// The default type for an untyped nil is untyped nil. We must not
// infer an untyped nil type as type parameter type. Ignore untyped
// nil by making sure all default argument types are typed.
if isTyped(targ) && !u.unify(par.typ, targ) {
errorf("default type", par.typ, targ, arg)
return nil
arg := args[i]
targ := Default(arg.typ)
// The default type for an untyped nil is untyped nil. We must not
// infer an untyped nil type as type parameter type. Ignore untyped
// nil by making sure all default argument types are typed.
if isTyped(targ) && !u.unify(par.typ, targ) {
errorf("default type", par.typ, targ, arg)
return nil
}
}
}