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If the C code had variables that were named the same as the prefixes used for name mangling, such as "tmp" or "ref", then the codegen would generate incorrect code in some cases. This was because these aliases were immediately visible to expressions that actually needed to use the original name. I introduced the concept of reserving aliases without enabling them. An alias that isn't enabled isn't visible to expression translation, but is still reserved so that sub-expressions generate aliases that don't overlap. Add test cases to cover the cases that would break before this change. Co-authored-by: Veikka Tuominen <git@vexu.eu>