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Add some long-overdue documentation on the INTERPOLATED helper macros.

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Paul Stansifer 2014-05-11 18:55:01 -04:00 • committed by Alex Crichton
parent 16351731ac
commit 0aae5574ea
1 changed files with 6 additions and 1 deletions
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7
src/libsyntax/parse/parser.rs
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@ -125,7 +125,11 @@ enum ItemOrViewItem {
IoviViewItem(ViewItem) IoviViewItem(ViewItem)
} }
/* The expr situation is not as complex as I thought it would be.
// Possibly accept an `INTERPOLATED` expression (a pre-parsed expression
// dropped into the token stream, which happens while parsing the
// result of macro expansion)
/* Placement of these is not as complex as I feared it would be.
The important thing is to make sure that lookahead doesn't balk The important thing is to make sure that lookahead doesn't balk
at INTERPOLATED tokens */ at INTERPOLATED tokens */
macro_rules! maybe_whole_expr ( macro_rules! maybe_whole_expr (
@ -156,6 +160,7 @@ macro_rules! maybe_whole_expr (
) )
) )
// As above, but for things other than expressions
macro_rules! maybe_whole ( macro_rules! maybe_whole (
($p:expr, $constructor:ident) => ( ($p:expr, $constructor:ident) => (
{ {