diff options
| -rw-r--r-- | library/core/src/fmt/mod.rs | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/library/core/src/fmt/mod.rs b/library/core/src/fmt/mod.rs index 10e1d27c88a..4cc2a9cf96d 100644 --- a/library/core/src/fmt/mod.rs +++ b/library/core/src/fmt/mod.rs @@ -2401,6 +2401,11 @@ impl Debug for str { f.write_char('"')?; let mut from = 0; for (i, c) in self.char_indices() { + // a fast path for ASCII chars that do not need escapes: + if matches!(c, ' '..='~') && !matches!(c, '\\' | '\"') { + continue; + } + let esc = c.escape_debug_ext(EscapeDebugExtArgs { escape_grapheme_extended: true, escape_single_quote: false, |