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-rw-r--r--compiler/rustc_parse/src/parser/stmt.rs169
1 files changed, 73 insertions, 96 deletions
diff --git a/compiler/rustc_parse/src/parser/stmt.rs b/compiler/rustc_parse/src/parser/stmt.rs
index 3d957406b..12753c678 100644
--- a/compiler/rustc_parse/src/parser/stmt.rs
+++ b/compiler/rustc_parse/src/parser/stmt.rs
@@ -1,7 +1,5 @@
-use super::attr::DEFAULT_INNER_ATTR_FORBIDDEN;
-use super::diagnostics::{
- AttemptLocalParseRecovery, Error, InvalidVariableDeclaration, InvalidVariableDeclarationSub,
-};
+use super::attr::InnerAttrForbiddenReason;
+use super::diagnostics::AttemptLocalParseRecovery;
use super::expr::LhsExpr;
use super::pat::RecoverComma;
use super::path::PathStyle;
@@ -9,6 +7,12 @@ use super::TrailingToken;
use super::{
AttrWrapper, BlockMode, FnParseMode, ForceCollect, Parser, Restrictions, SemiColonMode,
};
+use crate::errors::{
+ AssignmentElseNotAllowed, CompoundAssignmentExpressionInLet, ConstLetMutuallyExclusive,
+ DocCommentDoesNotDocumentAnything, ExpectedStatementAfterOuterAttr, InvalidCurlyInLetElse,
+ InvalidExpressionInLetElse, InvalidVariableDeclaration, InvalidVariableDeclarationSub,
+ WrapExpressionInParentheses,
+};
use crate::maybe_whole;
use rustc_ast as ast;
@@ -112,11 +116,7 @@ impl<'a> Parser<'a> {
let bl = self.parse_block()?;
// Destructuring assignment ... else.
// This is not allowed, but point it out in a nice way.
- let mut err = self.struct_span_err(
- e.span.to(bl.span),
- "<assignment> ... else { ... } is not allowed",
- );
- err.emit();
+ self.sess.emit_err(AssignmentElseNotAllowed { span: e.span.to(bl.span) });
}
self.mk_stmt(lo.to(e.span), StmtKind::Expr(e))
} else {
@@ -202,9 +202,12 @@ impl<'a> Parser<'a> {
fn error_outer_attrs(&self, attrs: &[Attribute]) {
if let [.., last] = attrs {
if last.is_doc_comment() {
- self.span_err(last.span, Error::UselessDocComment).emit();
+ self.sess.emit_err(DocCommentDoesNotDocumentAnything {
+ span: last.span,
+ missing_comma: None,
+ });
} else if attrs.iter().any(|a| a.style == AttrStyle::Outer) {
- self.struct_span_err(last.span, "expected statement after outer attribute").emit();
+ self.sess.emit_err(ExpectedStatementAfterOuterAttr { span: last.span });
}
}
}
@@ -255,17 +258,7 @@ impl<'a> Parser<'a> {
let lo = self.prev_token.span;
if self.token.is_keyword(kw::Const) && self.look_ahead(1, |t| t.is_ident()) {
- self.struct_span_err(
- lo.to(self.token.span),
- "`const` and `let` are mutually exclusive",
- )
- .span_suggestion(
- lo.to(self.token.span),
- "remove `let`",
- "const",
- Applicability::MaybeIncorrect,
- )
- .emit();
+ self.sess.emit_err(ConstLetMutuallyExclusive { span: lo.to(self.token.span) });
self.bump();
}
@@ -363,44 +356,27 @@ impl<'a> Parser<'a> {
fn check_let_else_init_bool_expr(&self, init: &ast::Expr) {
if let ast::ExprKind::Binary(op, ..) = init.kind {
if op.node.lazy() {
- let suggs = vec![
- (init.span.shrink_to_lo(), "(".to_string()),
- (init.span.shrink_to_hi(), ")".to_string()),
- ];
- self.struct_span_err(
- init.span,
- &format!(
- "a `{}` expression cannot be directly assigned in `let...else`",
- op.node.to_string()
- ),
- )
- .multipart_suggestion(
- "wrap the expression in parentheses",
- suggs,
- Applicability::MachineApplicable,
- )
- .emit();
+ self.sess.emit_err(InvalidExpressionInLetElse {
+ span: init.span,
+ operator: op.node.to_string(),
+ sugg: WrapExpressionInParentheses {
+ left: init.span.shrink_to_lo(),
+ right: init.span.shrink_to_hi(),
+ },
+ });
}
}
}
fn check_let_else_init_trailing_brace(&self, init: &ast::Expr) {
if let Some(trailing) = classify::expr_trailing_brace(init) {
- let err_span = trailing.span.with_lo(trailing.span.hi() - BytePos(1));
- let suggs = vec![
- (trailing.span.shrink_to_lo(), "(".to_string()),
- (trailing.span.shrink_to_hi(), ")".to_string()),
- ];
- self.struct_span_err(
- err_span,
- "right curly brace `}` before `else` in a `let...else` statement not allowed",
- )
- .multipart_suggestion(
- "try wrapping the expression in parentheses",
- suggs,
- Applicability::MachineApplicable,
- )
- .emit();
+ self.sess.emit_err(InvalidCurlyInLetElse {
+ span: trailing.span.with_lo(trailing.span.hi() - BytePos(1)),
+ sugg: WrapExpressionInParentheses {
+ left: trailing.span.shrink_to_lo(),
+ right: trailing.span.shrink_to_hi(),
+ },
+ });
}
}
@@ -409,18 +385,7 @@ impl<'a> Parser<'a> {
let eq_consumed = match self.token.kind {
token::BinOpEq(..) => {
// Recover `let x <op>= 1` as `let x = 1`
- self.struct_span_err(
- self.token.span,
- "can't reassign to an uninitialized variable",
- )
- .span_suggestion_short(
- self.token.span,
- "initialize the variable",
- "=",
- Applicability::MaybeIncorrect,
- )
- .help("if you meant to overwrite, remove the `let` binding")
- .emit();
+ self.sess.emit_err(CompoundAssignmentExpressionInLet { span: self.token.span });
self.bump();
true
}
@@ -434,7 +399,12 @@ impl<'a> Parser<'a> {
pub(super) fn parse_block(&mut self) -> PResult<'a, P<Block>> {
let (attrs, block) = self.parse_inner_attrs_and_block()?;
if let [.., last] = &*attrs {
- self.error_on_forbidden_inner_attr(last.span, DEFAULT_INNER_ATTR_FORBIDDEN);
+ self.error_on_forbidden_inner_attr(
+ last.span,
+ super::attr::InnerAttrPolicy::Forbidden(Some(
+ InnerAttrForbiddenReason::InCodeBlock,
+ )),
+ );
}
Ok(block)
}
@@ -583,39 +553,46 @@ impl<'a> Parser<'a> {
match stmt.kind {
// Expression without semicolon.
StmtKind::Expr(ref mut expr)
- if self.token != token::Eof && 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.
- if let Err(mut e) =
- self.expect_one_of(&[], &[token::Semi, token::CloseDelim(Delimiter::Brace)])
- {
- if let TokenKind::DocComment(..) = self.token.kind {
- if let Ok(snippet) = self.span_to_snippet(self.token.span) {
- let sp = self.token.span;
- let marker = &snippet[..3];
- let (comment_marker, doc_comment_marker) = marker.split_at(2);
-
- e.span_suggestion(
- sp.with_hi(sp.lo() + BytePos(marker.len() as u32)),
- &format!(
- "add a space before `{}` to use a regular comment",
- doc_comment_marker,
- ),
- format!("{} {}", comment_marker, doc_comment_marker),
- Applicability::MaybeIncorrect,
- );
+ // `expect_one_of` returns PResult<'a, bool /* recovered */>
+ let replace_with_err =
+ match self.expect_one_of(&[], &[token::Semi, token::CloseDelim(Delimiter::Brace)]) {
+ // Recover from parser, skip type error to avoid extra errors.
+ Ok(true) => true,
+ Err(mut e) => {
+ if let TokenKind::DocComment(..) = self.token.kind &&
+ let Ok(snippet) = self.span_to_snippet(self.token.span) {
+ let sp = self.token.span;
+ let marker = &snippet[..3];
+ let (comment_marker, doc_comment_marker) = marker.split_at(2);
+
+ e.span_suggestion(
+ sp.with_hi(sp.lo() + BytePos(marker.len() as u32)),
+ &format!(
+ "add a space before `{}` to use a regular comment",
+ doc_comment_marker,
+ ),
+ format!("{} {}", comment_marker, doc_comment_marker),
+ Applicability::MaybeIncorrect,
+ );
}
- }
- if let Err(mut e) =
- self.check_mistyped_turbofish_with_multiple_type_params(e, expr)
- {
- if recover.no() {
- return Err(e);
+
+ if let Err(mut e) =
+ self.check_mistyped_turbofish_with_multiple_type_params(e, expr)
+ {
+ if recover.no() {
+ return Err(e);
+ }
+ e.emit();
+ self.recover_stmt();
}
- e.emit();
- self.recover_stmt();
+ true
}
- // Don't complain about type errors in body tail after parse error (#57383).
+ _ => false
+ };
+ if replace_with_err {
+ // We already emitted an error, so don't emit another type error
let sp = expr.span.to(self.prev_token.span);
*expr = self.mk_expr_err(sp);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 07:57:28 +0000