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0e47bd16da
This clarifies that it is legal to return an invalid pointer from a function, provided that such pointer is not dereferenced. This matches current status quo of the language. Any change to this should be a proposal that argues for different semantics. It is also legal in C to return a pointer to a local. The C backend lowers such thing directly, so the corresponding warning in C must be disabled (`-Wno-return-stack-address`).