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This gets the new token-tree quasiquoter up to the point of being able to stand in for of
#ast
in the pipe protocol compiler;#ast
is only there in#[cfg(stage0)]
, whereas it'squote_expr!
andquote_type!
in#[cfg(stage1)]
and[#cfg(stage2)]
. Also makes the splicing machinery much more robust and extensible (you are allowed to splice anything that implementsToTokens
).While this looks like a lot of sound and noise for nothing, it enables (post-snapshot) cutting out substantial portions of the redundant macro machinery in the frontend.
#ast
and the quasiquoter is sort of the last thread holding it in place (from last summer).