diff options
Diffstat (limited to 'src/libsyntax/parse')
| -rw-r--r-- | src/libsyntax/parse/literal.rs | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/src/libsyntax/parse/literal.rs b/src/libsyntax/parse/literal.rs index 58573093127..18019a89130 100644 --- a/src/libsyntax/parse/literal.rs +++ b/src/libsyntax/parse/literal.rs @@ -171,12 +171,15 @@ impl LitKind { /// by an AST-based macro) or unavailable (e.g. from HIR pretty-printing). pub fn to_lit_token(&self) -> token::Lit { let (kind, symbol, suffix) = match *self { - LitKind::Str(string, ast::StrStyle::Cooked) => { - let escaped = string.as_str().escape_default().to_string(); - (token::Str, Symbol::intern(&escaped), None) + LitKind::Str(symbol, ast::StrStyle::Cooked) => { + // Don't re-intern unless the escaped string is different. + let s = &symbol.as_str(); + let escaped = s.escape_default().to_string(); + let symbol = if escaped == *s { symbol } else { Symbol::intern(&escaped) }; + (token::Str, symbol, None) } - LitKind::Str(string, ast::StrStyle::Raw(n)) => { - (token::StrRaw(n), string, None) + LitKind::Str(symbol, ast::StrStyle::Raw(n)) => { + (token::StrRaw(n), symbol, None) } LitKind::ByteStr(ref bytes) => { let string = bytes.iter().cloned().flat_map(ascii::escape_default) |