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Don't encode zero width or precision in fmt string.

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This commit is contained in:
Mara Bos 2025-11-11 17:17:23 +01:00
parent 564c78fe62
commit 560b12d094
1 changed files with 10 additions and 4 deletions
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14
compiler/rustc_ast_lowering/src/format.rs
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@ -393,13 +393,19 @@ fn expand_format_args<'hir>(
bytecode.extend_from_slice(&flags.to_le_bytes());
if let Some(val) = &o.width {
let (indirect, val) = make_count(val, &mut argmap);
bytecode[i] |= 1 << 1 | (indirect as u8) << 4;
bytecode.extend_from_slice(&val.to_le_bytes());
// Only encode if nonzero; zero is the default.
if indirect || val != 0 {
bytecode[i] |= 1 << 1 | (indirect as u8) << 4;
bytecode.extend_from_slice(&val.to_le_bytes());
}
}
if let Some(val) = &o.precision {
let (indirect, val) = make_count(val, &mut argmap);
bytecode[i] |= 1 << 2 | (indirect as u8) << 5;
bytecode.extend_from_slice(&val.to_le_bytes());
// Only encode if nonzero; zero is the default.
if indirect || val != 0 {
bytecode[i] |= 1 << 2 | (indirect as u8) << 5;
bytecode.extend_from_slice(&val.to_le_bytes());
}
}
}
if implicit_arg_index != position {