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Fix remaining meta-variable expression TODOs #94884

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merged 1 commit into from
Mar 15, 2022
Merged

Fix remaining meta-variable expression TODOs #94884

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8 changes: 6 additions & 2 deletions compiler/rustc_expand/src/mbe/macro_check.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -337,8 +337,12 @@ fn check_occurrences(
let name = MacroRulesNormalizedIdent::new(name);
check_ops_is_prefix(sess, node_id, macros, binders, ops, span, name);
}
// FIXME(c410-f3r) Check token (https://github.com/rust-lang/rust/issues/93902)
TokenTree::MetaVarExpr(..) => {}
TokenTree::MetaVarExpr(dl, ref mve) => {
let Some(name) = mve.ident().map(MacroRulesNormalizedIdent::new) else {
return;
};
check_ops_is_prefix(sess, node_id, macros, binders, ops, dl.entire(), name);
}
TokenTree::Delimited(_, ref del) => {
check_nested_occurrences(sess, node_id, &del.tts, macros, binders, ops, valid);
}
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7 changes: 5 additions & 2 deletions compiler/rustc_expand/src/mbe/macro_parser.rs
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Expand Up @@ -324,8 +324,11 @@ pub(super) fn count_names(ms: &[TokenTree]) -> usize {
TokenTree::Delimited(_, ref delim) => count_names(&delim.tts),
TokenTree::MetaVar(..) => 0,
TokenTree::MetaVarDecl(..) => 1,
// FIXME(c410-f3r) MetaVarExpr should be handled instead of being ignored
// https://github.com/rust-lang/rust/issues/9390
// Panicking here would abort execution because `parse_tree` makes use of this
// function. In other words, RHS meta-variable expressions eventually end-up here.
//
// `0` is still returned to inform that no meta-variable was found. `Meta-variables
// != Meta-variable expressions`
TokenTree::MetaVarExpr(..) => 0,
TokenTree::Sequence(_, ref seq) => seq.num_captures,
TokenTree::Token(..) => 0,
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6 changes: 3 additions & 3 deletions compiler/rustc_expand/src/mbe/metavar_expr.rs
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Expand Up @@ -62,9 +62,9 @@ impl MetaVarExpr {
Ok(rslt)
}

crate fn ident(&self) -> Option<&Ident> {
match self {
MetaVarExpr::Count(ident, _) | MetaVarExpr::Ignore(ident) => Some(&ident),
crate fn ident(&self) -> Option<Ident> {
match *self {
MetaVarExpr::Count(ident, _) | MetaVarExpr::Ignore(ident) => Some(ident),
MetaVarExpr::Index(..) | MetaVarExpr::Length(..) => None,
}
}
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4 changes: 2 additions & 2 deletions compiler/rustc_expand/src/mbe/transcribe.rs
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Expand Up @@ -399,7 +399,7 @@ fn lockstep_iter_size(
TokenTree::MetaVarExpr(_, ref expr) => {
let default_rslt = LockstepIterSize::Unconstrained;
let Some(ident) = expr.ident() else { return default_rslt; };
let name = MacroRulesNormalizedIdent::new(ident.clone());
let name = MacroRulesNormalizedIdent::new(ident);
match lookup_cur_matched(name, interpolations, repeats) {
Some(MatchedSeq(ref ads)) => {
default_rslt.with(LockstepIterSize::Constraint(ads.len(), name))
Expand Down Expand Up @@ -479,7 +479,7 @@ fn count_repetitions<'a>(
count(cx, 0, depth_opt, matched, sp)
}

/// Returns a `NamedMatch` item declared on the RHS given an arbitrary [Ident]
/// Returns a `NamedMatch` item declared on the LHS given an arbitrary [Ident]
fn matched_from_ident<'ctx, 'interp, 'rslt>(
cx: &ExtCtxt<'ctx>,
ident: Ident,
Expand Down