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Joe Savona
d2b2a1b195
If you have a local helper function that itself returns a function (`() => () => { ... }`), we currently infer the return effect of the outer function as `Create mutable`. We correctly track the aliasing, but we lose some precision because we don't understand that a function specifically is being returned.
Here, we do some extra analysis of which values are returned in InferMutationAliasingRanges, and if the sole return value is a function we infer a `CreateFunction` effect. We also infer an `Assign` (instead of a Create) if the sole return value was one of the context variables or parameters.