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[CSSimplify] Check whether parameter refers to generic parameters before attempting inference from default

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This commit is contained in:
Pavel Yaskevich
2022-02-18 16:59:02 -08:00
parent aea76ca358
commit aa286b7bf4
1 changed files with 12 additions and 5 deletions
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17
lib/Sema/CSSimplify.cpp
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@@ -1632,17 +1632,24 @@ static ConstraintSystem::TypeMatchResult matchCallArguments(
if (parameterBindings[paramIdx].empty()) {
auto &ctx = cs.getASTContext();
if (paramTy->hasTypeVariable() &&
ctx.TypeCheckerOpts.EnableTypeInferenceFromDefaultArguments) {
if (ctx.TypeCheckerOpts.EnableTypeInferenceFromDefaultArguments) {
auto *paramList = getParameterList(callee);
auto defaultExprType = paramList->get(paramIdx)->getTypeOfDefaultExpr();
auto *PD = paramList->get(paramIdx);
// There is nothing to infer if parameter doesn't have any
// generic parameters in its type.
if (!PD->getInterfaceType()->hasTypeParameter())
continue;
auto defaultExprType = PD->getTypeOfDefaultExpr();
// A caller side default.
if (!defaultExprType || defaultExprType->hasError())
continue;
// If this is just a regular default type that works
// for any generic parameter type, let's continue.
// If this is just a regular default type that should
// work for all substitutions of generic parameter,
// let's continue.
if (defaultExprType->hasArchetype())
continue;