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Fix compiling empty fmt! strings #7227

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Merged
merged 1 commit into from
Jun 22, 2013
Merged

Fix compiling empty fmt! strings #7227

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5 changes: 5 additions & 0 deletions src/libsyntax/ext/fmt.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -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();
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3 changes: 3 additions & 0 deletions src/test/run-pass/syntax-extension-fmt.rs
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Expand Up @@ -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
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