Emit references to shadowed variables in if-let shorthands #77177
+49
−26
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Variables defined in if-let shorthand now get their own definition and references to the variable use that definition.
Track the original-decl/captured decl as part of the symbol passed to the IndexConsumer. This allows the Rename consumer to check if the symbol is a shadowed reference to a decl being renamed, without the index skipping the other relevant output when visiting shadowing variables.
This change stores variables from if-let shorthand syntax in the indexstore, when indexing locals, because those are local variables too. As opposed to purely being references to their shadowed declaration.
Resolves #76805