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Merge pull request #2821 from topecongiro/issue-2721

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Return the trimmed original snippet when formatting macro def failed
This commit is contained in:
Nick Cameron 2018-07-01 14:37:30 +12:00 committed by GitHub
commit 41398047bc
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3 changed files with 68 additions and 1 deletions
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5
src/macros.rs
View File

@ -411,7 +411,10 @@ pub fn rewrite_macro_def(
result += &arm_shape.indent.to_string_with_newline(context.config);
}
result += write_list(&branch_items, &fmt)?.as_str();
match write_list(&branch_items, &fmt) {
Some(ref s) => result += s,
None => return snippet,
}
if multi_branch_style {
result += &indent.to_string_with_newline(context.config);

32
tests/source/macro_rules.rs
View File

@ -230,3 +230,35 @@ macro_rules! save_regs {
:::: "intel", "volatile");
};
}
// #2721
macro_rules! impl_as_byte_slice_arrays {
($n:expr,) => {};
($n:expr, $N:ident, $($NN:ident,)*) => {
impl_as_byte_slice_arrays!($n - 1, $($NN,)*);
impl<T> AsByteSliceMut for [T; $n] where [T]: AsByteSliceMut {
fn as_byte_slice_mut(&mut self) -> &mut [u8] {
self[..].as_byte_slice_mut()
}
fn to_le(&mut self) {
self[..].to_le()
}
}
};
(!div $n:expr,) => {};
(!div $n:expr, $N:ident, $($NN:ident,)*) => {
impl_as_byte_slice_arrays!(!div $n / 2, $($NN,)*);
impl<T> AsByteSliceMut for [T; $n] where [T]: AsByteSliceMut {
fn as_byte_slice_mut(&mut self) -> &mut [u8] {
self[..].as_byte_slice_mut()
}
fn to_le(&mut self) {
self[..].to_le()
}
}
};
}

32
tests/target/macro_rules.rs
View File

@ -271,3 +271,35 @@ macro_rules! save_regs {
:::: "intel", "volatile");
};
}
// #2721
macro_rules! impl_as_byte_slice_arrays {
($n:expr,) => {};
($n:expr, $N:ident, $($NN:ident,)*) => {
impl_as_byte_slice_arrays!($n - 1, $($NN,)*);
impl<T> AsByteSliceMut for [T; $n] where [T]: AsByteSliceMut {
fn as_byte_slice_mut(&mut self) -> &mut [u8] {
self[..].as_byte_slice_mut()
}
fn to_le(&mut self) {
self[..].to_le()
}
}
};
(!div $n:expr,) => {};
(!div $n:expr, $N:ident, $($NN:ident,)*) => {
impl_as_byte_slice_arrays!(!div $n / 2, $($NN,)*);
impl<T> AsByteSliceMut for [T; $n] where [T]: AsByteSliceMut {
fn as_byte_slice_mut(&mut self) -> &mut [u8] {
self[..].as_byte_slice_mut()
}
fn to_le(&mut self) {
self[..].to_le()
}
}
};
}