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Hamish Knight d98cb9e2b3 [Mangler] Mangle function type for invalid enum element

Previously we would mangle a single ErrorType as
the type for the element, but that would fail to
demangle since we expect a function type. Use the
same logic as AbstractFunctionDecl, mangling a
function type of ErrorType. While here, also
handle SubscriptDecls and check for error types
rather than `isInvalid()`.

rdar://129065620

2024-06-11 21:24:11 +01:00

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 // RUN: %empty-directory(%t)
 // RUN: not %target-swift-frontend -typecheck %s -index-store-path %t
 // rdar://129065620 - Make sure we don't crash when verifying the mangling.
 enum Foo {
   case bar(id: UInt32)
   case bar(id: UInt32)
 }
 struct S {
   subscript(x: Invalid) -> Invalid {}
 }