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2311049b27
fixes #23998 In `fitNode` the first symbol of a symchoice that expects an enum type with the same enum type is given as the result of the `fitNode`. But `getConstExpr` is also called on it, which will return a `nil` node for nodes that aren't constant but have the enum type, like variables or proc parameters. Instead we just return the node directly since it's already typed. Normally, this `if` branch in `fitNode` shouldn't exist since `paramTypesMatch` handles it, but the way pure enum symbols work makes it really impractical to check their ambiguity, which `paramTypesMatch` won't like. If it causes problems for regular enums we can restrict this branch to just pure enums until they are hopefully eventually removed.