diff options
Diffstat (limited to 'src/libsyntax/ext')
| -rw-r--r-- | src/libsyntax/ext/fmt.rs | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/libsyntax/ext/fmt.rs b/src/libsyntax/ext/fmt.rs index 3ebe844950a..6a877040f48 100644 --- a/src/libsyntax/ext/fmt.rs +++ b/src/libsyntax/ext/fmt.rs @@ -96,7 +96,7 @@ fn pieces_to_expr(cx: @ext_ctxt, sp: span, } } fn make_ty(cx: @ext_ctxt, sp: span, t: Ty) -> @ast::expr { - let mut rt_type; + let rt_type; match t { TyHex(c) => match c { CaseUpper => rt_type = ~"TyHexUpper", @@ -272,6 +272,7 @@ fn pieces_to_expr(cx: @ext_ctxt, sp: span, /* Translate each piece (portion of the fmt expression) by invoking the corresponding function in core::unstable::extfmt. Each function takes a buffer to insert data into along with the data being formatted. */ + let npieces = pieces.len(); do vec::consume(pieces) |i, pc| { match pc { /* Raw strings get appended via str::push_str */ @@ -279,9 +280,10 @@ fn pieces_to_expr(cx: @ext_ctxt, sp: span, let portion = mk_uniq_str(cx, fmt_sp, s); /* If this is the first portion, then initialize the local - buffer with it directly */ + buffer with it directly. If it's actually the only piece, + then there's no need for it to be mutable */ if i == 0 { - stms.push(mk_local(cx, fmt_sp, true, ident, portion)); + stms.push(mk_local(cx, fmt_sp, npieces > 1, ident, portion)); } else { let args = ~[mk_mut_addr_of(cx, fmt_sp, buf()), portion]; let call = mk_call_global(cx, |