Rollup merge of #43292 - kennytm:fix-quasi-quoting-warning-in-rustbuild, r=alexcrichton
Workaround "Quasi-quoting is inefficient" warning in incremental rustbuild introduced in #43252. After #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 #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 #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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