Use Parser's restrictions instead of let_expr_allowed
#100011
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#99156 (`codegen_fulfill_obligation` expect erased regions) - rust-lang#99293 (only run --all-targets in stage0 for Std) - rust-lang#99779 (Fix item info pos and height) - rust-lang#99994 (Remove `guess_head_span`) - rust-lang#100011 (Use Parser's `restrictions` instead of `let_expr_allowed`) - rust-lang#100017 (kmc-solid: Update `Socket::connect_timeout` to be in line with rust-lang#78802) - rust-lang#100037 (Update rustc man page to match `rustc --help`) - rust-lang#100042 (Update books) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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This also means that the
ALLOW_LETflag is reset properly for subexpressions, so we can properly deny things likea && (b && let c = d). Also the parser is a tiny bit smaller now.It doesn't reject all bad
letexpr usages, just a bit more.cc @c410-f3r