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[ConstraintSystem] Implement uninitialized pattern binding support

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This like `let x: Int` or `let (x, y), ...` are now supported by
the constraint solver.
This commit is contained in:
Pavel Yaskevich
2021-08-17 14:18:34 -07:00
parent d64c19ec37
commit c87e0e149a
3 changed files with 46 additions and 10 deletions
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8
lib/Sema/ConstraintSystem.cpp
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@@ -5438,6 +5438,12 @@ SolutionApplicationTarget::forPropertyWrapperInitializer(
ContextualPattern
SolutionApplicationTarget::getContextualPattern() const {
if (kind == Kind::uninitializedVar) {
assert(patternBinding);
return ContextualPattern::forPatternBindingDecl(patternBinding,
uninitializedVar.index);
}
assert(kind == Kind::expression);
assert(expression.contextualPurpose == CTP_Initialization ||
expression.contextualPurpose == CTP_ForEachStmt);
@@ -5553,6 +5559,8 @@ void ConstraintSystem::diagnoseFailureFor(SolutionApplicationTarget target) {
nominal->diagnose(diag::property_wrapper_declared_here,
nominal->getName());
}
} else if (auto *var = target.getAsUninitializedVar()) {
DE.diagnose(target.getLoc(), diag::failed_to_produce_diagnostic);
} else {
// Emit a poor fallback message.
DE.diagnose(target.getAsFunction()->getLoc(),