Let expressions on RHS shouldn't be terminating scopes#103034
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bors merged 1 commit intorust-lang:masterfrom Oct 19, 2022
Merged
Let expressions on RHS shouldn't be terminating scopes#103034bors merged 1 commit intorust-lang:masterfrom
bors merged 1 commit intorust-lang:masterfrom
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Rollup of 6 pull requests Successful merges: - rust-lang#102863 (Standardize "use parentheses to call" suggestions between typeck and trait selection) - rust-lang#103034 (Let expressions on RHS shouldn't be terminating scopes) - rust-lang#103127 (Make transpose const and inline) - rust-lang#103153 (Allow `Vec::leak` when using `no_global_oom_handling`) - rust-lang#103182 (Clean up query descriptions) - rust-lang#103216 (Consider patterns in fn params in an `Elided(Infer)` lifetime rib.) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
This was referenced Oct 19, 2022
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Fixes #100276.
Before this PR, we were unconditionally marking the RHS of short-circuiting binary expressions as a terminating scope.
In the case of a let chain where the
letexpression was on the RHS, this meant that temporaries within theletexpr would only live until the end of the expression. Since this only affected the RHS, this led to surprising behavior (example).After this PR, we only mark the RHS as a terminating scope if it is not a
letexpression.