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Deadbeef
2025-08-09 13:24:06 +08:00
parent 4c7749e8c8
commit ad1113f87e
93 changed files with 1043 additions and 1056 deletions
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206
compiler/rustc_parse/src/parser/expr.rs
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@@ -6,7 +6,6 @@ use core::ops::{Bound, ControlFlow};
use ast::mut_visit::{self, MutVisitor};
use ast::token::IdentIsRaw;
use ast::{CoroutineKind, ForLoopKind, GenBlockKind, MatchKind, Pat, Path, PathSegment, Recovered};
use rustc_ast::ptr::P;
use rustc_ast::token::{self, Delimiter, InvisibleOrigin, MetaVarKind, Token, TokenKind};
use rustc_ast::tokenstream::TokenTree;
use rustc_ast::util::case::Case;
@@ -56,7 +55,7 @@ pub(super) enum DestructuredFloat {
impl<'a> Parser<'a> {
/// Parses an expression.
#[inline]
pub fn parse_expr(&mut self) -> PResult<'a, P<Expr>> {
pub fn parse_expr(&mut self) -> PResult<'a, Box<Expr>> {
self.current_closure.take();
let attrs = self.parse_outer_attributes()?;
@@ -64,7 +63,7 @@ impl<'a> Parser<'a> {
}
/// Parses an expression, forcing tokens to be collected.
pub fn parse_expr_force_collect(&mut self) -> PResult<'a, P<Expr>> {
pub fn parse_expr_force_collect(&mut self) -> PResult<'a, Box<Expr>> {
self.current_closure.take();
// If the expression is associative (e.g. `1 + 2`), then any preceding
@@ -90,7 +89,10 @@ impl<'a> Parser<'a> {
self.parse_expr().map(|value| AnonConst { id: DUMMY_NODE_ID, value })
}
fn parse_expr_catch_underscore(&mut self, restrictions: Restrictions) -> PResult<'a, P<Expr>> {
fn parse_expr_catch_underscore(
&mut self,
restrictions: Restrictions,
) -> PResult<'a, Box<Expr>> {
let attrs = self.parse_outer_attributes()?;
match self.parse_expr_res(restrictions, attrs) {
Ok((expr, _)) => Ok(expr),
@@ -109,7 +111,7 @@ impl<'a> Parser<'a> {
}
/// Parses a sequence of expressions delimited by parentheses.
fn parse_expr_paren_seq(&mut self) -> PResult<'a, ThinVec<P<Expr>>> {
fn parse_expr_paren_seq(&mut self) -> PResult<'a, ThinVec<Box<Expr>>> {
self.parse_paren_comma_seq(|p| p.parse_expr_catch_underscore(Restrictions::empty()))
.map(|(r, _)| r)
}
@@ -120,7 +122,7 @@ impl<'a> Parser<'a> {
&mut self,
r: Restrictions,
attrs: AttrWrapper,
) -> PResult<'a, (P<Expr>, bool)> {
) -> PResult<'a, (Box<Expr>, bool)> {
self.with_res(r, |this| this.parse_expr_assoc_with(Bound::Unbounded, attrs))
}
@@ -131,7 +133,7 @@ impl<'a> Parser<'a> {
&mut self,
min_prec: Bound<ExprPrecedence>,
attrs: AttrWrapper,
) -> PResult<'a, (P<Expr>, bool)> {
) -> PResult<'a, (Box<Expr>, bool)> {
let lhs = if self.token.is_range_separator() {
return self.parse_expr_prefix_range(attrs).map(|res| (res, false));
} else {
@@ -147,8 +149,8 @@ impl<'a> Parser<'a> {
&mut self,
min_prec: Bound<ExprPrecedence>,
starts_stmt: bool,
mut lhs: P<Expr>,
) -> PResult<'a, (P<Expr>, bool)> {
mut lhs: Box<Expr>,
) -> PResult<'a, (Box<Expr>, bool)> {
let mut parsed_something = false;
if !self.should_continue_as_assoc_expr(&lhs) {
return Ok((lhs, parsed_something));
@@ -414,10 +416,10 @@ impl<'a> Parser<'a> {
fn parse_expr_range(
&mut self,
prec: ExprPrecedence,
lhs: P<Expr>,
lhs: Box<Expr>,
limits: RangeLimits,
cur_op_span: Span,
) -> PResult<'a, P<Expr>> {
) -> PResult<'a, Box<Expr>> {
let rhs = if self.is_at_start_of_range_notation_rhs() {
let maybe_lt = self.token;
let attrs = self.parse_outer_attributes()?;
@@ -448,7 +450,7 @@ impl<'a> Parser<'a> {
}
/// Parses prefix-forms of range notation: `..expr`, `..`, `..=expr`.
fn parse_expr_prefix_range(&mut self, attrs: AttrWrapper) -> PResult<'a, P<Expr>> {
fn parse_expr_prefix_range(&mut self, attrs: AttrWrapper) -> PResult<'a, Box<Expr>> {
if !attrs.is_empty() {
let err = errors::DotDotRangeAttribute { span: self.token.span };
self.dcx().emit_err(err);
@@ -490,7 +492,7 @@ impl<'a> Parser<'a> {
}
/// Parses a prefix-unary-operator expr.
fn parse_expr_prefix(&mut self, attrs: AttrWrapper) -> PResult<'a, P<Expr>> {
fn parse_expr_prefix(&mut self, attrs: AttrWrapper) -> PResult<'a, Box<Expr>> {
let lo = self.token.span;
macro_rules! make_it {
@@ -564,7 +566,7 @@ impl<'a> Parser<'a> {
}
}
fn parse_expr_prefix_common(&mut self, lo: Span) -> PResult<'a, (Span, P<Expr>)> {
fn parse_expr_prefix_common(&mut self, lo: Span) -> PResult<'a, (Span, Box<Expr>)> {
self.bump();
let attrs = self.parse_outer_attributes()?;
let expr = if self.token.is_range_separator() {
@@ -653,12 +655,12 @@ impl<'a> Parser<'a> {
fn parse_assoc_op_cast(
&mut self,
lhs: P<Expr>,
lhs: Box<Expr>,
lhs_span: Span,
op_span: Span,
expr_kind: fn(P<Expr>, P<Ty>) -> ExprKind,
) -> PResult<'a, P<Expr>> {
let mk_expr = |this: &mut Self, lhs: P<Expr>, rhs: P<Ty>| {
expr_kind: fn(Box<Expr>, Box<Ty>) -> ExprKind,
) -> PResult<'a, Box<Expr>> {
let mk_expr = |this: &mut Self, lhs: Box<Expr>, rhs: Box<Ty>| {
this.mk_expr(this.mk_expr_sp(&lhs, lhs_span, op_span, rhs.span), expr_kind(lhs, rhs))
};
@@ -873,7 +875,7 @@ impl<'a> Parser<'a> {
}
/// Parses `a.b` or `a(13)` or `a[4]` or just `a`.
fn parse_expr_dot_or_call(&mut self, attrs: AttrWrapper) -> PResult<'a, P<Expr>> {
fn parse_expr_dot_or_call(&mut self, attrs: AttrWrapper) -> PResult<'a, Box<Expr>> {
self.collect_tokens_for_expr(attrs, |this, attrs| {
let base = this.parse_expr_bottom()?;
let span = this.interpolated_or_expr_span(&base);
@@ -884,9 +886,9 @@ impl<'a> Parser<'a> {
pub(super) fn parse_expr_dot_or_call_with(
&mut self,
mut attrs: ast::AttrVec,
mut e: P<Expr>,
mut e: Box<Expr>,
lo: Span,
) -> PResult<'a, P<Expr>> {
) -> PResult<'a, Box<Expr>> {
let mut res = ensure_sufficient_stack(|| {
loop {
let has_question =
@@ -945,8 +947,8 @@ impl<'a> Parser<'a> {
pub(super) fn parse_dot_suffix_expr(
&mut self,
lo: Span,
base: P<Expr>,
) -> PResult<'a, P<Expr>> {
base: Box<Expr>,
) -> PResult<'a, Box<Expr>> {
// At this point we've consumed something like `expr.` and `self.token` holds the token
// after the dot.
match self.token.uninterpolate().kind {
@@ -1232,10 +1234,10 @@ impl<'a> Parser<'a> {
&self,
lo: Span,
ident_span: Span,
base: P<Expr>,
base: Box<Expr>,
field: Symbol,
suffix: Option<Symbol>,
) -> P<Expr> {
) -> Box<Expr> {
if let Some(suffix) = suffix {
self.expect_no_tuple_index_suffix(ident_span, suffix);
}
@@ -1243,7 +1245,7 @@ impl<'a> Parser<'a> {
}
/// Parse a function call expression, `expr(...)`.
fn parse_expr_fn_call(&mut self, lo: Span, fun: P<Expr>) -> P<Expr> {
fn parse_expr_fn_call(&mut self, lo: Span, fun: Box<Expr>) -> Box<Expr> {
let snapshot = if self.token == token::OpenParen {
Some((self.create_snapshot_for_diagnostic(), fun.kind.clone()))
} else {
@@ -1267,9 +1269,9 @@ impl<'a> Parser<'a> {
&mut self,
lo: Span,
open_paren: Span,
seq: PResult<'a, P<Expr>>,
seq: PResult<'a, Box<Expr>>,
snapshot: Option<(SnapshotParser<'a>, ExprKind)>,
) -> PResult<'a, P<Expr>> {
) -> PResult<'a, Box<Expr>> {
match (self.may_recover(), seq, snapshot) {
(true, Err(err), Some((mut snapshot, ExprKind::Path(None, path)))) => {
snapshot.bump(); // `(`
@@ -1325,7 +1327,7 @@ impl<'a> Parser<'a> {
}
/// Parse an indexing expression `expr[...]`.
fn parse_expr_index(&mut self, lo: Span, base: P<Expr>) -> PResult<'a, P<Expr>> {
fn parse_expr_index(&mut self, lo: Span, base: Box<Expr>) -> PResult<'a, Box<Expr>> {
let prev_span = self.prev_token.span;
let open_delim_span = self.token.span;
self.bump(); // `[`
@@ -1339,7 +1341,7 @@ impl<'a> Parser<'a> {
}
/// Assuming we have just parsed `.`, continue parsing into an expression.
fn parse_dot_suffix(&mut self, self_arg: P<Expr>, lo: Span) -> PResult<'a, P<Expr>> {
fn parse_dot_suffix(&mut self, self_arg: Box<Expr>, lo: Span) -> PResult<'a, Box<Expr>> {
if self.token_uninterpolated_span().at_least_rust_2018() && self.eat_keyword(exp!(Await)) {
return Ok(self.mk_await_expr(self_arg, lo));
}
@@ -1404,7 +1406,7 @@ impl<'a> Parser<'a> {
///
/// N.B., this does not parse outer attributes, and is private because it only works
/// correctly if called from `parse_expr_dot_or_call`.
fn parse_expr_bottom(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_bottom(&mut self) -> PResult<'a, Box<Expr>> {
maybe_recover_from_interpolated_ty_qpath!(self, true);
let span = self.token.span;
@@ -1556,7 +1558,7 @@ impl<'a> Parser<'a> {
})
}
fn parse_expr_lit(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_lit(&mut self) -> PResult<'a, Box<Expr>> {
let lo = self.token.span;
match self.parse_opt_token_lit() {
Some((token_lit, _)) => {
@@ -1567,7 +1569,7 @@ impl<'a> Parser<'a> {
}
}
fn parse_expr_tuple_parens(&mut self, restrictions: Restrictions) -> PResult<'a, P<Expr>> {
fn parse_expr_tuple_parens(&mut self, restrictions: Restrictions) -> PResult<'a, Box<Expr>> {
let lo = self.token.span;
self.expect(exp!(OpenParen))?;
let (es, trailing_comma) = match self.parse_seq_to_end(
@@ -1596,7 +1598,7 @@ impl<'a> Parser<'a> {
self.maybe_recover_from_bad_qpath(expr)
}
fn parse_expr_array_or_repeat(&mut self, close: ExpTokenPair<'_>) -> PResult<'a, P<Expr>> {
fn parse_expr_array_or_repeat(&mut self, close: ExpTokenPair<'_>) -> PResult<'a, Box<Expr>> {
let lo = self.token.span;
self.bump(); // `[` or other open delim
@@ -1627,7 +1629,7 @@ impl<'a> Parser<'a> {
self.maybe_recover_from_bad_qpath(expr)
}
fn parse_expr_path_start(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_path_start(&mut self) -> PResult<'a, Box<Expr>> {
let maybe_eq_tok = self.prev_token;
let (qself, path) = if self.eat_lt() {
let lt_span = self.prev_token.span;
@@ -1653,7 +1655,7 @@ impl<'a> Parser<'a> {
self.dcx().emit_err(errors::MacroInvocationWithQualifiedPath(path.span));
}
let lo = path.span;
let mac = P(MacCall { path, args: self.parse_delim_args()? });
let mac = Box::new(MacCall { path, args: self.parse_delim_args()? });
(lo.to(self.prev_token.span), ExprKind::MacCall(mac))
} else if self.check(exp!(OpenBrace))
&& let Some(expr) = self.maybe_parse_struct_expr(&qself, &path)
@@ -1675,7 +1677,7 @@ impl<'a> Parser<'a> {
&mut self,
label_: Label,
mut consume_colon: bool,
) -> PResult<'a, P<Expr>> {
) -> PResult<'a, Box<Expr>> {
let lo = label_.ident.span;
let label = Some(label_);
let ate_colon = self.eat(exp!(Colon));
@@ -1810,7 +1812,7 @@ impl<'a> Parser<'a> {
}
/// Recover on the syntax `do catch { ... }` suggesting `try { ... }` instead.
fn recover_do_catch(&mut self) -> PResult<'a, P<Expr>> {
fn recover_do_catch(&mut self) -> PResult<'a, Box<Expr>> {
let lo = self.token.span;
self.bump(); // `do`
@@ -1823,12 +1825,12 @@ impl<'a> Parser<'a> {
}
/// Parse an expression if the token can begin one.
fn parse_expr_opt(&mut self) -> PResult<'a, Option<P<Expr>>> {
fn parse_expr_opt(&mut self) -> PResult<'a, Option<Box<Expr>>> {
Ok(if self.token.can_begin_expr() { Some(self.parse_expr()?) } else { None })
}
/// Parse `"return" expr?`.
fn parse_expr_return(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_return(&mut self) -> PResult<'a, Box<Expr>> {
let lo = self.prev_token.span;
let kind = ExprKind::Ret(self.parse_expr_opt()?);
let expr = self.mk_expr(lo.to(self.prev_token.span), kind);
@@ -1836,7 +1838,7 @@ impl<'a> Parser<'a> {
}
/// Parse `"do" "yeet" expr?`.
fn parse_expr_yeet(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_yeet(&mut self) -> PResult<'a, Box<Expr>> {
let lo = self.token.span;
self.bump(); // `do`
@@ -1851,7 +1853,7 @@ impl<'a> Parser<'a> {
}
/// Parse `"become" expr`, with `"become"` token already eaten.
fn parse_expr_become(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_become(&mut self) -> PResult<'a, Box<Expr>> {
let lo = self.prev_token.span;
let kind = ExprKind::Become(self.parse_expr()?);
let span = lo.to(self.prev_token.span);
@@ -1868,7 +1870,7 @@ impl<'a> Parser<'a> {
/// `break 'lbl: loop {}`); a labeled break with an unlabeled loop as its value
/// expression only gets a warning for compatibility reasons; and a labeled break
/// with a labeled loop does not even get a warning because there is no ambiguity.
fn parse_expr_break(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_break(&mut self) -> PResult<'a, Box<Expr>> {
let lo = self.prev_token.span;
let mut label = self.eat_label();
let kind = if self.token == token::Colon
@@ -1930,7 +1932,7 @@ impl<'a> Parser<'a> {
}
/// Parse `"continue" label?`.
fn parse_expr_continue(&mut self, lo: Span) -> PResult<'a, P<Expr>> {
fn parse_expr_continue(&mut self, lo: Span) -> PResult<'a, Box<Expr>> {
let mut label = self.eat_label();
// Recover `continue label` -> `continue 'label`
@@ -1947,7 +1949,7 @@ impl<'a> Parser<'a> {
}
/// Parse `"yield" expr?`.
fn parse_expr_yield(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_yield(&mut self) -> PResult<'a, Box<Expr>> {
let lo = self.prev_token.span;
let kind = ExprKind::Yield(YieldKind::Prefix(self.parse_expr_opt()?));
let span = lo.to(self.prev_token.span);
@@ -1957,7 +1959,7 @@ impl<'a> Parser<'a> {
}
/// Parse `builtin # ident(args,*)`.
fn parse_expr_builtin(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_builtin(&mut self) -> PResult<'a, Box<Expr>> {
self.parse_builtin(|this, lo, ident| {
Ok(match ident.name {
sym::offset_of => Some(this.parse_expr_offset_of(lo)?),
@@ -2005,7 +2007,7 @@ impl<'a> Parser<'a> {
}
/// Built-in macro for `offset_of!` expressions.
pub(crate) fn parse_expr_offset_of(&mut self, lo: Span) -> PResult<'a, P<Expr>> {
pub(crate) fn parse_expr_offset_of(&mut self, lo: Span) -> PResult<'a, Box<Expr>> {
let container = self.parse_ty()?;
self.expect(exp!(Comma))?;
@@ -2033,7 +2035,7 @@ impl<'a> Parser<'a> {
}
/// Built-in macro for type ascription expressions.
pub(crate) fn parse_expr_type_ascribe(&mut self, lo: Span) -> PResult<'a, P<Expr>> {
pub(crate) fn parse_expr_type_ascribe(&mut self, lo: Span) -> PResult<'a, Box<Expr>> {
let expr = self.parse_expr()?;
self.expect(exp!(Comma))?;
let ty = self.parse_ty()?;
@@ -2045,7 +2047,7 @@ impl<'a> Parser<'a> {
&mut self,
lo: Span,
kind: UnsafeBinderCastKind,
) -> PResult<'a, P<Expr>> {
) -> PResult<'a, Box<Expr>> {
let expr = self.parse_expr()?;
let ty = if self.eat(exp!(Comma)) { Some(self.parse_ty()?) } else { None };
let span = lo.to(self.token.span);
@@ -2155,7 +2157,7 @@ impl<'a> Parser<'a> {
/// Keep this in sync with `Token::can_begin_literal_maybe_minus` and
/// `Lit::from_token` (excluding unary negation).
fn eat_token_lit(&mut self) -> Option<token::Lit> {
let check_expr = |expr: P<Expr>| {
let check_expr = |expr: Box<Expr>| {
if let ast::ExprKind::Lit(token_lit) = expr.kind {
Some(token_lit)
} else if let ast::ExprKind::Unary(UnOp::Neg, inner) = &expr.kind
@@ -2243,7 +2245,7 @@ impl<'a> Parser<'a> {
/// Matches `'-' lit | lit` (cf. `ast_validation::AstValidator::check_expr_within_pat`).
/// Keep this in sync with `Token::can_begin_literal_maybe_minus`.
pub fn parse_literal_maybe_minus(&mut self) -> PResult<'a, P<Expr>> {
pub fn parse_literal_maybe_minus(&mut self) -> PResult<'a, Box<Expr>> {
if let Some(expr) = self.eat_metavar_seq_with_matcher(
|mv_kind| matches!(mv_kind, MetaVarKind::Expr { .. }),
|this| {
@@ -2290,7 +2292,7 @@ impl<'a> Parser<'a> {
/// Emits a suggestion if it looks like the user meant an array but
/// accidentally used braces, causing the code to be interpreted as a block
/// expression.
fn maybe_suggest_brackets_instead_of_braces(&mut self, lo: Span) -> Option<P<Expr>> {
fn maybe_suggest_brackets_instead_of_braces(&mut self, lo: Span) -> Option<Box<Expr>> {
let mut snapshot = self.create_snapshot_for_diagnostic();
match snapshot.parse_expr_array_or_repeat(exp!(CloseBrace)) {
Ok(arr) => {
@@ -2360,7 +2362,7 @@ impl<'a> Parser<'a> {
opt_label: Option<Label>,
lo: Span,
blk_mode: BlockCheckMode,
) -> PResult<'a, P<Expr>> {
) -> PResult<'a, Box<Expr>> {
if self.may_recover() && self.is_array_like_block() {
if let Some(arr) = self.maybe_suggest_brackets_instead_of_braces(lo) {
return Ok(arr);
@@ -2383,13 +2385,13 @@ impl<'a> Parser<'a> {
}
/// Parse a block which takes no attributes and has no label
fn parse_simple_block(&mut self) -> PResult<'a, P<Expr>> {
fn parse_simple_block(&mut self) -> PResult<'a, Box<Expr>> {
let blk = self.parse_block()?;
Ok(self.mk_expr(blk.span, ExprKind::Block(blk, None)))
}
/// Parses a closure expression (e.g., `move |args| expr`).
fn parse_expr_closure(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_closure(&mut self) -> PResult<'a, Box<Expr>> {
let lo = self.token.span;
let before = self.prev_token;
@@ -2494,7 +2496,7 @@ impl<'a> Parser<'a> {
}
/// If an explicit return type is given, require a block to appear (RFC 968).
fn parse_closure_block_body(&mut self, ret_span: Span) -> PResult<'a, P<Expr>> {
fn parse_closure_block_body(&mut self, ret_span: Span) -> PResult<'a, Box<Expr>> {
if self.may_recover()
&& self.token.can_begin_expr()
&& self.token.kind != TokenKind::OpenBrace
@@ -2565,7 +2567,7 @@ impl<'a> Parser<'a> {
}
/// Parses the `|arg, arg|` header of a closure.
fn parse_fn_block_decl(&mut self) -> PResult<'a, (P<FnDecl>, Span)> {
fn parse_fn_block_decl(&mut self) -> PResult<'a, (Box<FnDecl>, Span)> {
let arg_start = self.token.span.lo();
let inputs = if self.eat(exp!(OrOr)) {
@@ -2587,7 +2589,7 @@ impl<'a> Parser<'a> {
let output =
self.parse_ret_ty(AllowPlus::Yes, RecoverQPath::Yes, RecoverReturnSign::Yes)?;
Ok((P(FnDecl { inputs, output }), arg_span))
Ok((Box::new(FnDecl { inputs, output }), arg_span))
}
/// Parses a parameter in a closure header (e.g., `|arg, arg|`).
@@ -2618,7 +2620,7 @@ impl<'a> Parser<'a> {
}
/// Parses an `if` expression (`if` token already eaten).
fn parse_expr_if(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_if(&mut self) -> PResult<'a, Box<Expr>> {
let lo = self.prev_token.span;
// Scoping code checks the top level edition of the `if`; let's match it here.
// The `CondChecker` also checks the edition of the `let` itself, just to make sure.
@@ -2627,7 +2629,7 @@ impl<'a> Parser<'a> {
self.parse_if_after_cond(lo, cond)
}
fn parse_if_after_cond(&mut self, lo: Span, mut cond: P<Expr>) -> PResult<'a, P<Expr>> {
fn parse_if_after_cond(&mut self, lo: Span, mut cond: Box<Expr>) -> PResult<'a, Box<Expr>> {
let cond_span = cond.span;
// Tries to interpret `cond` as either a missing expression if it's a block,
// or as an unfinished expression if it's a binop and the RHS is a block.
@@ -2737,7 +2739,10 @@ impl<'a> Parser<'a> {
/// i.e. the same span we use to later decide whether the drop behaviour should be that of
/// edition `..=2021` or that of `2024..`.
// Public because it is used in rustfmt forks such as https://github.com/tucant/rustfmt/blob/30c83df9e1db10007bdd16dafce8a86b404329b2/src/parse/macros/html.rs#L57 for custom if expressions.
pub fn parse_expr_cond(&mut self, let_chains_policy: LetChainsPolicy) -> PResult<'a, P<Expr>> {
pub fn parse_expr_cond(
&mut self,
let_chains_policy: LetChainsPolicy,
) -> PResult<'a, Box<Expr>> {
let attrs = self.parse_outer_attributes()?;
let (mut cond, _) =
self.parse_expr_res(Restrictions::NO_STRUCT_LITERAL | Restrictions::ALLOW_LET, attrs)?;
@@ -2748,7 +2753,7 @@ impl<'a> Parser<'a> {
}
/// Parses a `let $pat = $expr` pseudo-expression.
fn parse_expr_let(&mut self, restrictions: Restrictions) -> PResult<'a, P<Expr>> {
fn parse_expr_let(&mut self, restrictions: Restrictions) -> PResult<'a, Box<Expr>> {
let recovered = if !restrictions.contains(Restrictions::ALLOW_LET) {
let err = errors::ExpectedExpressionFoundLet {
span: self.token.span,
@@ -2790,7 +2795,7 @@ impl<'a> Parser<'a> {
}
/// Parses an `else { ... }` expression (`else` token already eaten).
fn parse_expr_else(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_else(&mut self) -> PResult<'a, Box<Expr>> {
let else_span = self.prev_token.span; // `else`
let attrs = self.parse_outer_attributes()?; // For recovery.
let expr = if self.eat_keyword(exp!(If)) {
@@ -2888,7 +2893,7 @@ impl<'a> Parser<'a> {
}
}
fn error_on_extra_if(&mut self, cond: &P<Expr>) -> PResult<'a, ()> {
fn error_on_extra_if(&mut self, cond: &Box<Expr>) -> PResult<'a, ()> {
if let ExprKind::Binary(Spanned { span: binop_span, node: binop }, _, right) = &cond.kind
&& let BinOpKind::And = binop
&& let ExprKind::If(cond, ..) = &right.kind
@@ -2901,7 +2906,7 @@ impl<'a> Parser<'a> {
}
}
fn parse_for_head(&mut self) -> PResult<'a, (P<Pat>, P<Expr>)> {
fn parse_for_head(&mut self) -> PResult<'a, (Box<Pat>, Box<Expr>)> {
let begin_paren = if self.token == token::OpenParen {
// Record whether we are about to parse `for (`.
// This is used below for recovery in case of `for ( $stuff ) $block`
@@ -2967,7 +2972,7 @@ impl<'a> Parser<'a> {
}
/// Parses `for await? <src_pat> in <src_expr> <src_loop_block>` (`for` token already eaten).
fn parse_expr_for(&mut self, opt_label: Option<Label>, lo: Span) -> PResult<'a, P<Expr>> {
fn parse_expr_for(&mut self, opt_label: Option<Label>, lo: Span) -> PResult<'a, Box<Expr>> {
let is_await =
self.token_uninterpolated_span().at_least_rust_2018() && self.eat_keyword(exp!(Await));
@@ -3036,7 +3041,7 @@ impl<'a> Parser<'a> {
}
/// Parses a `while` or `while let` expression (`while` token already eaten).
fn parse_expr_while(&mut self, opt_label: Option<Label>, lo: Span) -> PResult<'a, P<Expr>> {
fn parse_expr_while(&mut self, opt_label: Option<Label>, lo: Span) -> PResult<'a, Box<Expr>> {
let policy = LetChainsPolicy::EditionDependent { current_edition: lo.edition() };
let cond = self.parse_expr_cond(policy).map_err(|mut err| {
err.span_label(lo, "while parsing the condition of this `while` expression");
@@ -3064,7 +3069,7 @@ impl<'a> Parser<'a> {
}
/// Parses `loop { ... }` (`loop` token already eaten).
fn parse_expr_loop(&mut self, opt_label: Option<Label>, lo: Span) -> PResult<'a, P<Expr>> {
fn parse_expr_loop(&mut self, opt_label: Option<Label>, lo: Span) -> PResult<'a, Box<Expr>> {
let loop_span = self.prev_token.span;
let (attrs, body) = self.parse_inner_attrs_and_block(
// Only suggest moving erroneous block label to the loop header
@@ -3094,7 +3099,7 @@ impl<'a> Parser<'a> {
}
/// Parses a `match ... { ... }` expression (`match` token already eaten).
fn parse_expr_match(&mut self) -> PResult<'a, P<Expr>> {
fn parse_expr_match(&mut self) -> PResult<'a, Box<Expr>> {
let match_span = self.prev_token.span;
let attrs = self.parse_outer_attributes()?;
let (scrutinee, _) = self.parse_expr_res(Restrictions::NO_STRUCT_LITERAL, attrs)?;
@@ -3108,9 +3113,9 @@ impl<'a> Parser<'a> {
&mut self,
lo: Span,
match_span: Span,
scrutinee: P<Expr>,
scrutinee: Box<Expr>,
match_kind: MatchKind,
) -> PResult<'a, P<Expr>> {
) -> PResult<'a, Box<Expr>> {
if let Err(mut e) = self.expect(exp!(OpenBrace)) {
if self.token == token::Semi {
e.span_suggestion_short(
@@ -3167,7 +3172,7 @@ impl<'a> Parser<'a> {
/// Attempt to recover from match arm body with statements and no surrounding braces.
fn parse_arm_body_missing_braces(
&mut self,
first_expr: &P<Expr>,
first_expr: &Box<Expr>,
arrow_span: Span,
) -> Option<(Span, ErrorGuaranteed)> {
if self.token != token::Semi {
@@ -3439,7 +3444,7 @@ impl<'a> Parser<'a> {
})
}
fn parse_match_arm_guard(&mut self) -> PResult<'a, Option<P<Expr>>> {
fn parse_match_arm_guard(&mut self) -> PResult<'a, Option<Box<Expr>>> {
// Used to check the `if_let_guard` feature mostly by scanning
// `&&` tokens.
fn has_let_expr(expr: &Expr) -> bool {
@@ -3470,7 +3475,7 @@ impl<'a> Parser<'a> {
Ok(Some(cond))
}
fn parse_match_arm_pat_and_guard(&mut self) -> PResult<'a, (P<Pat>, Option<P<Expr>>)> {
fn parse_match_arm_pat_and_guard(&mut self) -> PResult<'a, (Box<Pat>, Option<Box<Expr>>)> {
if self.token == token::OpenParen {
let left = self.token.span;
let pat = self.parse_pat_no_top_guard(
@@ -3510,7 +3515,7 @@ impl<'a> Parser<'a> {
}
}
fn parse_match_guard_condition(&mut self) -> PResult<'a, P<Expr>> {
fn parse_match_guard_condition(&mut self) -> PResult<'a, Box<Expr>> {
let attrs = self.parse_outer_attributes()?;
match self.parse_expr_res(Restrictions::ALLOW_LET | Restrictions::IN_IF_GUARD, attrs) {
Ok((expr, _)) => Ok(expr),
@@ -3544,7 +3549,7 @@ impl<'a> Parser<'a> {
}
/// Parses a `try {...}` expression (`try` token already eaten).
fn parse_try_block(&mut self, span_lo: Span) -> PResult<'a, P<Expr>> {
fn parse_try_block(&mut self, span_lo: Span) -> PResult<'a, Box<Expr>> {
let (attrs, body) = self.parse_inner_attrs_and_block(None)?;
if self.eat_keyword(exp!(Catch)) {
Err(self.dcx().create_err(errors::CatchAfterTry { span: self.prev_token.span }))
@@ -3573,7 +3578,7 @@ impl<'a> Parser<'a> {
}
/// Parses an `async move? {...}` or `gen move? {...}` expression.
fn parse_gen_block(&mut self) -> PResult<'a, P<Expr>> {
fn parse_gen_block(&mut self) -> PResult<'a, Box<Expr>> {
let lo = self.token.span;
let kind = if self.eat_keyword(exp!(Async)) {
if self.eat_keyword(exp!(Gen)) { GenBlockKind::AsyncGen } else { GenBlockKind::Async }
@@ -3622,9 +3627,9 @@ impl<'a> Parser<'a> {
fn maybe_parse_struct_expr(
&mut self,
qself: &Option<P<ast::QSelf>>,
qself: &Option<Box<ast::QSelf>>,
path: &ast::Path,
) -> Option<PResult<'a, P<Expr>>> {
) -> Option<PResult<'a, Box<Expr>>> {
let struct_allowed = !self.restrictions.contains(Restrictions::NO_STRUCT_LITERAL);
if struct_allowed || self.is_certainly_not_a_block() {
if let Err(err) = self.expect(exp!(OpenBrace)) {
@@ -3818,10 +3823,10 @@ impl<'a> Parser<'a> {
/// Precondition: already parsed the '{'.
pub(super) fn parse_expr_struct(
&mut self,
qself: Option<P<ast::QSelf>>,
qself: Option<Box<ast::QSelf>>,
pth: ast::Path,
recover: bool,
) -> PResult<'a, P<Expr>> {
) -> PResult<'a, Box<Expr>> {
let lo = pth.span;
let (fields, base, recovered_async) =
self.parse_struct_fields(pth.clone(), recover, exp!(CloseBrace))?;
@@ -3830,7 +3835,7 @@ impl<'a> Parser<'a> {
let expr = if let Some(guar) = recovered_async {
ExprKind::Err(guar)
} else {
ExprKind::Struct(P(ast::StructExpr { qself, path: pth, fields, rest: base }))
ExprKind::Struct(Box::new(ast::StructExpr { qself, path: pth, fields, rest: base }))
};
Ok(self.mk_expr(span, expr))
}
@@ -3945,14 +3950,14 @@ impl<'a> Parser<'a> {
self.dcx().emit_err(errors::LeftArrowOperator { span });
}
fn mk_assign_op(&self, assign_op: AssignOp, lhs: P<Expr>, rhs: P<Expr>) -> ExprKind {
fn mk_assign_op(&self, assign_op: AssignOp, lhs: Box<Expr>, rhs: Box<Expr>) -> ExprKind {
ExprKind::AssignOp(assign_op, lhs, rhs)
}
fn mk_range(
&mut self,
start: Option<P<Expr>>,
end: Option<P<Expr>>,
start: Option<Box<Expr>>,
end: Option<Box<Expr>>,
limits: RangeLimits,
) -> ExprKind {
if end.is_none() && limits == RangeLimits::Closed {
@@ -3963,51 +3968,56 @@ impl<'a> Parser<'a> {
}
}
fn mk_unary(&self, unop: UnOp, expr: P<Expr>) -> ExprKind {
fn mk_unary(&self, unop: UnOp, expr: Box<Expr>) -> ExprKind {
ExprKind::Unary(unop, expr)
}
fn mk_binary(&self, binop: BinOp, lhs: P<Expr>, rhs: P<Expr>) -> ExprKind {
fn mk_binary(&self, binop: BinOp, lhs: Box<Expr>, rhs: Box<Expr>) -> ExprKind {
ExprKind::Binary(binop, lhs, rhs)
}
fn mk_index(&self, expr: P<Expr>, idx: P<Expr>, brackets_span: Span) -> ExprKind {
fn mk_index(&self, expr: Box<Expr>, idx: Box<Expr>, brackets_span: Span) -> ExprKind {
ExprKind::Index(expr, idx, brackets_span)
}
fn mk_call(&self, f: P<Expr>, args: ThinVec<P<Expr>>) -> ExprKind {
fn mk_call(&self, f: Box<Expr>, args: ThinVec<Box<Expr>>) -> ExprKind {
ExprKind::Call(f, args)
}
fn mk_await_expr(&mut self, self_arg: P<Expr>, lo: Span) -> P<Expr> {
fn mk_await_expr(&mut self, self_arg: Box<Expr>, lo: Span) -> Box<Expr> {
let span = lo.to(self.prev_token.span);
let await_expr = self.mk_expr(span, ExprKind::Await(self_arg, self.prev_token.span));
self.recover_from_await_method_call();
await_expr
}
fn mk_use_expr(&mut self, self_arg: P<Expr>, lo: Span) -> P<Expr> {
fn mk_use_expr(&mut self, self_arg: Box<Expr>, lo: Span) -> Box<Expr> {
let span = lo.to(self.prev_token.span);
let use_expr = self.mk_expr(span, ExprKind::Use(self_arg, self.prev_token.span));
self.recover_from_use();
use_expr
}
pub(crate) fn mk_expr_with_attrs(&self, span: Span, kind: ExprKind, attrs: AttrVec) -> P<Expr> {
P(Expr { kind, span, attrs, id: DUMMY_NODE_ID, tokens: None })
pub(crate) fn mk_expr_with_attrs(
&self,
span: Span,
kind: ExprKind,
attrs: AttrVec,
) -> Box<Expr> {
Box::new(Expr { kind, span, attrs, id: DUMMY_NODE_ID, tokens: None })
}
pub(crate) fn mk_expr(&self, span: Span, kind: ExprKind) -> P<Expr> {
pub(crate) fn mk_expr(&self, span: Span, kind: ExprKind) -> Box<Expr> {
self.mk_expr_with_attrs(span, kind, AttrVec::new())
}
pub(super) fn mk_expr_err(&self, span: Span, guar: ErrorGuaranteed) -> P<Expr> {
pub(super) fn mk_expr_err(&self, span: Span, guar: ErrorGuaranteed) -> Box<Expr> {
self.mk_expr(span, ExprKind::Err(guar))
}
/// Create expression span ensuring the span of the parent node
/// is larger than the span of lhs and rhs, including the attributes.
fn mk_expr_sp(&self, lhs: &P<Expr>, lhs_span: Span, op_span: Span, rhs_span: Span) -> Span {
fn mk_expr_sp(&self, lhs: &Box<Expr>, lhs_span: Span, op_span: Span, rhs_span: Span) -> Span {
lhs.attrs
.iter()
.find(|a| a.style == AttrStyle::Outer)
@@ -4019,8 +4029,8 @@ impl<'a> Parser<'a> {
fn collect_tokens_for_expr(
&mut self,
attrs: AttrWrapper,
f: impl FnOnce(&mut Self, ast::AttrVec) -> PResult<'a, P<Expr>>,
) -> PResult<'a, P<Expr>> {
f: impl FnOnce(&mut Self, ast::AttrVec) -> PResult<'a, Box<Expr>>,
) -> PResult<'a, Box<Expr>> {
self.collect_tokens(None, attrs, ForceCollect::No, |this, attrs| {
let res = f(this, attrs)?;
let trailing = Trailing::from(