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d78bf22413
receive {
switch <HERE>
}
In the current Parser implementation, if there's a error in 'switch'
subject, the 'SwitchStmt' is not placed in the parsed AST.
When the type checker searches AST node at the location, it used to find
'receive { ... }' because that is the *innermost* node in the AST that
contains the loc. But the decl context is the closure. This behavior used
to cause crashes because 'receive { ... }' is re-typechecked.
For solution, when finding the innermost AST node, clear the found node
in parent context before walking into brace statement.
rdar://problem/69246891