Stabilize half_open_range_patterns

Author: Urgau

compiler/rustc_feature/src/accepted.rs

@@ -169,6 +169,8 @@ declare_features! (
     (accepted, global_allocator, "1.28.0", Some(27389), None),
     // FIXME: explain `globs`.
     (accepted, globs, "1.0.0", None, None),
+    /// Allows using `..=X` as a pattern.
+    (accepted, half_open_range_patterns, "CURRENT_RUSTC_VERSION", Some(67264), None),
     /// Allows using the `u128` and `i128` types.
     (accepted, i128_type, "1.26.0", Some(35118), None),
     /// Allows the use of `if let` expressions.

compiler/rustc_middle/src/lib.rs

@@ -44,7 +44,7 @@
 #![feature(type_alias_impl_trait)]
 #![feature(associated_type_bounds)]
 #![feature(rustc_attrs)]
-#![feature(half_open_range_patterns)]
+#![cfg_attr(bootstrap, feature(half_open_range_patterns))]
 #![feature(control_flow_enum)]
 #![feature(associated_type_defaults)]
 #![feature(trusted_step)]

compiler/rustc_parse/src/parser/pat.rs

@@ -777,7 +777,6 @@ impl<'a> Parser<'a> {
     /// expression syntax `...expr` for splatting in expressions.
     fn parse_pat_range_to(&mut self, mut re: Spanned<RangeEnd>) -> PResult<'a, PatKind> {
         let end = self.parse_pat_range_end()?;
-        self.sess.gated_spans.gate(sym::half_open_range_patterns, re.span.to(self.prev_token.span));
         if let RangeEnd::Included(ref mut syn @ RangeSyntax::DotDotDot) = &mut re.node {
             *syn = RangeSyntax::DotDotEq;
             self.struct_span_err(re.span, "range-to patterns with `...` are not allowed")

src/doc/unstable-book/src/language-features/half-open-range-patterns.md

@@ -1,4 +1,3 @@
-#![feature(half_open_range_patterns)]
 #![feature(exclusive_range_pattern)]
 
 fn main() {

src/test/ui/half-open-range-patterns/exclusive_range_pattern_syntax_collision3.rs

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/exclusive_range_pattern_syntax_collision3.rs:6:12
+  --> $DIR/exclusive_range_pattern_syntax_collision3.rs:5:12
    |
 LL |     match [5..4, 99..105, 43..44] {
    |           ----------------------- this expression has type `[std::ops::Range<{integer}>; 3]`
@@ -10,7 +10,7 @@ LL |         [..9, 99..100, _] => {},
                 found type `{integer}`
 
 error[E0308]: mismatched types
-  --> $DIR/exclusive_range_pattern_syntax_collision3.rs:6:15
+  --> $DIR/exclusive_range_pattern_syntax_collision3.rs:5:15
    |
 LL |     match [5..4, 99..105, 43..44] {
    |           ----------------------- this expression has type `[std::ops::Range<{integer}>; 3]`
@@ -23,7 +23,7 @@ LL |         [..9, 99..100, _] => {},
                 found type `{integer}`
 
 error[E0308]: mismatched types
-  --> $DIR/exclusive_range_pattern_syntax_collision3.rs:6:19
+  --> $DIR/exclusive_range_pattern_syntax_collision3.rs:5:19
    |
 LL |     match [5..4, 99..105, 43..44] {
    |           ----------------------- this expression has type `[std::ops::Range<{integer}>; 3]`

src/test/ui/half-open-range-patterns/exclusive_range_pattern_syntax_collision3.stderr

@@ -1,4 +1,3 @@
-#![feature(half_open_range_patterns)]
 #![feature(exclusive_range_pattern)]
 
 fn main() {

src/test/ui/half-open-range-patterns/feature-gate-half-open-range-patterns.rs

@@ -1,17 +1,17 @@
 error[E0029]: only `char` and numeric types are allowed in range patterns
-  --> $DIR/half-open-range-pats-bad-types.rs:5:9
+  --> $DIR/half-open-range-pats-bad-types.rs:4:9
    |
 LL |     let "a".. = "a";
    |         ^^^ this is of type `&'static str` but it should be `char` or numeric
 
 error[E0029]: only `char` and numeric types are allowed in range patterns
-  --> $DIR/half-open-range-pats-bad-types.rs:6:11
+  --> $DIR/half-open-range-pats-bad-types.rs:5:11
    |
 LL |     let .."a" = "a";
    |           ^^^ this is of type `&'static str` but it should be `char` or numeric
 
 error[E0029]: only `char` and numeric types are allowed in range patterns
-  --> $DIR/half-open-range-pats-bad-types.rs:7:12
+  --> $DIR/half-open-range-pats-bad-types.rs:6:12
    |
 LL |     let ..="a" = "a";
    |            ^^^ this is of type `&'static str` but it should be `char` or numeric