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Allow trailing commas in if_let_chain

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This commit is contained in:
Manish Goregaokar 2016-03-27 04:24:42 +05:30
parent f3fdbd0d89
commit 07dc709ba4
1 changed files with 11 additions and 0 deletions
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11
src/utils/mod.rs
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@ -55,6 +55,7 @@ pub const STRING_PATH: [&'static str; 3] = ["collections", "string", "String"];
pub const TRANSMUTE_PATH: [&'static str; 3] = ["core", "intrinsics", "transmute"];
pub const VEC_FROM_ELEM_PATH: [&'static str; 3] = ["std", "vec", "from_elem"];
pub const VEC_PATH: [&'static str; 3] = ["collections", "vec", "Vec"];
pub const BOX_PATH: [&'static str; 3] = ["std", "boxed", "Box"];
/// Produce a nested chain of if-lets and ifs from the patterns:
///
@ -90,6 +91,11 @@ macro_rules! if_let_chain {
$block
}
};
([let $pat:pat = $expr:expr,], $block:block) => {
if let $pat = $expr {
$block
}
};
([$expr:expr, $($tt:tt)+], $block:block) => {
if $expr {
if_let_chain!{ [$($tt)+], $block }
@ -100,6 +106,11 @@ macro_rules! if_let_chain {
$block
}
};
([$expr:expr,], $block:block) => {
if $expr {
$block
}
};
}
/// Returns true if the two spans come from differing expansions (i.e. one is from a macro and one