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Remove MacCall special cases from Parser::parse_full_stmt

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It is impossible for expr here to be a braced macro call. Expr comes
from `parse_stmt_without_recovery`, in which macro calls are parsed by
`parse_stmt_mac`. See this part:

    let kind = if (style == MacStmtStyle::Braces
        && self.token != token::Dot
        && self.token != token::Question)
        || self.token == token::Semi
        || self.token == token::Eof
    {
        StmtKind::MacCall(P(MacCallStmt { mac, style, attrs, tokens: None }))
    } else {
        // Since none of the above applied, this is an expression statement macro.
        let e = self.mk_expr(lo.to(hi), ExprKind::MacCall(mac));
        let e = self.maybe_recover_from_bad_qpath(e)?;
        let e = self.parse_expr_dot_or_call_with(e, lo, attrs)?;
        let e = self.parse_expr_assoc_with(
            0,
            LhsExpr::AlreadyParsed { expr: e, starts_statement: false },
        )?;
        StmtKind::Expr(e)
    };

A braced macro call at the head of a statement is always either extended
into ExprKind::Field / MethodCall / Await / Try / Binary, or else
returned as StmtKind::MacCall. We can never get a StmtKind::Expr
containing ExprKind::MacCall containing brace delimiter.
This commit is contained in:
David Tolnay 2023-12-29 18:04:04 -08:00
parent aedc1b6ad4
commit 53521faf06
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GPG Key ID: F9BA143B95FF6D82
1 changed files with 3 additions and 9 deletions
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12
compiler/rustc_parse/src/parser/stmt.rs
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@ -648,10 +648,8 @@ pub fn parse_full_stmt(
match &mut stmt.kind {
// Expression without semicolon.
StmtKind::Expr(expr)
if match expr.kind {
ExprKind::MacCall(_) => true,
_ => classify::expr_requires_semi_to_be_stmt(expr),
} && !expr.attrs.is_empty()
if classify::expr_requires_semi_to_be_stmt(expr)
&& !expr.attrs.is_empty()
&& ![token::Eof, token::Semi, token::CloseDelim(Delimiter::Brace)]
.contains(&self.token.kind) =>
{
@ -664,11 +662,7 @@ pub fn parse_full_stmt(
// Expression without semicolon.
StmtKind::Expr(expr)
if self.token != token::Eof
&& match expr.kind {
ExprKind::MacCall(_) => true,
_ => classify::expr_requires_semi_to_be_stmt(expr),
} =>
if self.token != token::Eof && classify::expr_requires_semi_to_be_stmt(expr) =>
{
// Just check for errors and recover; do not eat semicolon yet.