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Rollup merge of rust-lang#43292 - kennytm:fix-quasi-quoting-warning-in-rustbuild, r=alexcrichton
Workaround "Quasi-quoting is inefficient" warning in incremental rustbuild introduced in rust-lang#43252. After rust-lang#43252 is merged, building stage0 libcore with `-i` (`--incremental`) flag will cause 17 "Quasi-quoting might make incremental compilation very inefficient: NtExpr(..)" warnings, as in rust-lang#40946. ``` warning: Quasi-quoting might make incremental compilation very inefficient: NtExpr(..) --> src/libcore/default.rs:133:21 | 133 | #[doc = $doc] | ^^^^ ... 139 | default_impl! { (), (), "Returns the default value of `()`" } | ------------------------------------------------------------- in this macro invocation (× 17) ``` True fix for rust-lang#40946 will take at least 12 weeks from now to make into the next stage0, so it is quicker to workaround it in libcore instead. cc @vbrandl @jseyfried
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src/libcore/default.rs

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@@ -126,7 +126,7 @@ pub trait Default: Sized {
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}
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macro_rules! default_impl {
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($t:ty, $v:expr, $doc:expr) => {
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($t:ty, $v:expr, $doc:tt) => {
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#[stable(feature = "rust1", since = "1.0.0")]
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impl Default for $t {
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#[inline]

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