[rustc_builtin_macros] add indices to format_foreign::printf::Substitution::Escape #92460
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…askrgr Rollup of 7 pull requests Successful merges: - rust-lang#88310 (Lock bootstrap (x.py) build directory) - rust-lang#92097 (Implement split_at_spare_mut without Deref to a slice so that the spare slice is valid) - rust-lang#92412 (Fix double space in pretty printed TryBlock) - rust-lang#92420 (Fix whitespace in pretty printed PatKind::Range) - rust-lang#92457 (Sync rustc_codegen_gcc) - rust-lang#92460 ([rustc_builtin_macros] add indices to format_foreign::printf::Substitution::Escape) - rust-lang#92469 (Make tidy check for magic numbers that spell things) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Fixes #92267.
The problem was that the escape string "%%" does not need to appear at the very beginning of the format string, but
the iterator implementation assumed that it did.
The solution follows the pattern used by
format_foregin::shell::Subtitution::Escape:rust/compiler/rustc_builtin_macros/src/format_foreign.rs
Line 629 in 8ed935e