Fix codegen of 'missing lifetimes' when functions have &mut return but no &mut params
#1254
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Fixes #1238. This also takes the opportunity to: * improve diagnostics for some of the existing cases of functions rejected for reference shenanigans; * be more consistent about how we determine 'reference-ness' of return values and parameters.
adetaylor
changed the title
&mut return but no &mut params
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Fixes #1238.