bjoernager/rust
bjoernager/rust
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remove type ascription feature gate

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This commit is contained in:
yukang 2023-05-08 06:49:50 +08:00
parent dd5d7c729d
commit b002c9ff11
4 changed files with 5 additions and 40 deletions
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35
compiler/rustc_ast_passes/src/feature_gate.rs
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@ -2,7 +2,7 @@ use rustc_ast as ast;
use rustc_ast::visit::{self, AssocCtxt, FnCtxt, FnKind, Visitor};
use rustc_ast::{attr, AssocConstraint, AssocConstraintKind, NodeId};
use rustc_ast::{PatKind, RangeEnd};
use rustc_errors::{Applicability, StashKey};
use rustc_errors::StashKey;
use rustc_feature::{AttributeGate, BuiltinAttribute, Features, GateIssue, BUILTIN_ATTRIBUTE_MAP};
use rustc_session::parse::{feature_err, feature_err_issue, feature_warn};
use rustc_session::Session;
@ -375,43 +375,13 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
}
fn visit_stmt(&mut self, stmt: &'a ast::Stmt) {
if let ast::StmtKind::Semi(expr) = &stmt.kind
&& let ast::ExprKind::Assign(lhs, _, _) = &expr.kind
&& let ast::ExprKind::Type(..) = lhs.kind
&& self.sess.parse_sess.span_diagnostic.err_count() == 0
&& !self.features.type_ascription
&& !lhs.span.allows_unstable(sym::type_ascription)
{
// When we encounter a statement of the form `foo: Ty = val;`, this will emit a type
// ascription error, but the likely intention was to write a `let` statement. (#78907).
feature_err(
&self.sess.parse_sess,
sym::type_ascription,
lhs.span,
"type ascription is experimental",
).span_suggestion_verbose(
lhs.span.shrink_to_lo(),
"you might have meant to introduce a new binding",
"let ",
Applicability::MachineApplicable,
).emit();
}
visit::walk_stmt(self, stmt);
}
fn visit_expr(&mut self, e: &'a ast::Expr) {
match e.kind {
ast::ExprKind::Type(..) => {
if self.sess.parse_sess.span_diagnostic.err_count() == 0 {
// To avoid noise about type ascription in common syntax errors,
// only emit if it is the *only* error.
gate_feature_post!(
&self,
type_ascription,
e.span,
"type ascription is experimental"
);
} else {
if self.sess.parse_sess.span_diagnostic.err_count() > 0 {
// And if it isn't, cancel the early-pass warning.
if let Some(err) = self
.sess
@ -629,7 +599,6 @@ pub fn check_crate(krate: &ast::Crate, sess: &Session) {
gate_all!(box_patterns, "box pattern syntax is experimental");
gate_all!(exclusive_range_pattern, "exclusive range pattern syntax is experimental");
gate_all!(try_blocks, "`try` blocks are unstable");
gate_all!(type_ascription, "type ascription is experimental");
visit::walk_crate(&mut visitor, krate);
}