Assertion fail in lambda code completion #274
Description
auto x = []{^
The issue:
- x is itself a valid completion
- in the code-complete callback, we try to compute its linkage (for two reasons: as a CC signal, and to compute USR->symbol ID for index merge)
- at this point its type is "undeduced auto" and its linkage is external, this gets cached
- after the code-complete callback the parser bails out, sema attaches the initializer to the variable
x - now
xhas type unspellable-lambda, so its linkage should de-facto internal, which doesn't match the cache - this inconsistency is caught by an assertion