You're right, in certain cases it would still cause trouble, but it would be a l... | Hacker News

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Dylan16807 on March 23, 2016 | parent | context | favorite | on: Cross-platform Rust rewrite of the GNU coreutils

You're right, in certain cases it would still cause trouble, but it would be a lot fewer cases than 100%. Reading only once would be safe, and passing it to another functions would make a variable that can no longer change unexpectedly.

dbaupp on March 23, 2016 [–]

Unless the function is inlined/the compiler can deduce that the variable is undef.

(Of course, you could define it to work, but I would suspect that would make this sort of value much less useful.)

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