Fix RCA panic on lambda with explicit return #2194
Merged
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This fixes a quirk leftover from the fixes in #649 and #793. Those introduced and then updated a conditional that avoided unifying certain types during type checking, but it turns out it was always safe to unconditionally unify the types once #649 introduced the explicit return type tracking. With this fix, the lifted lambda callables with explicit returns have the correct output type instead of always being
Unit
and RCA is able to use that type information as expected, avoiding the panic.Fixes #2186