diff options
| -rw-r--r-- | src/libsyntax/ext/fmt.rs | 5 | ||||
| -rw-r--r-- | src/test/run-pass/syntax-extension-fmt.rs | 3 |
2 files changed, 8 insertions, 0 deletions
diff --git a/src/libsyntax/ext/fmt.rs b/src/libsyntax/ext/fmt.rs index 74496ac5359..4425d54987c 100644 --- a/src/libsyntax/ext/fmt.rs +++ b/src/libsyntax/ext/fmt.rs @@ -249,6 +249,11 @@ fn pieces_to_expr(cx: @ExtCtxt, sp: span, } } + /* Short circuit an easy case up front (won't work otherwise) */ + if pieces.len() == 0 { + return cx.expr_str_uniq(args[0].span, @""); + } + let fmt_sp = args[0].span; let mut n = 0u; let nargs = args.len(); diff --git a/src/test/run-pass/syntax-extension-fmt.rs b/src/test/run-pass/syntax-extension-fmt.rs index 67573fce2cd..fe7b510cfe7 100644 --- a/src/test/run-pass/syntax-extension-fmt.rs +++ b/src/test/run-pass/syntax-extension-fmt.rs @@ -58,6 +58,9 @@ fn part1() { test(fmt!("%x", 0xffffffff_u), ~"ffffffff"); test(fmt!("%o", 0xffffffff_u), ~"37777777777"); test(fmt!("%t", 0xffffffff_u), ~"11111111111111111111111111111111"); + + // Don't result in a compilation error + test(fmt!(""), ~""); } fn part2() { // Widths |