Stabilize dotdoteq_in_patterns language feature.

Stabilize `match 2 { 1..=3 => {} }`.

src/libsyntax/feature_gate.rs

@@ -26,7 +26,7 @@ use self::AttributeType::*;
 use self::AttributeGate::*;
 
 use abi::Abi;
-use ast::{self, NodeId, PatKind, RangeEnd, RangeSyntax};
+use ast::{self, NodeId, PatKind, RangeEnd};
 use attr;
 use epoch::Epoch;
 use codemap::Spanned;
@@ -399,9 +399,6 @@ declare_features! (
     // allow `'_` placeholder lifetimes
     (active, underscore_lifetimes, "1.22.0", Some(44524), None),
 
-    // allow `..=` in patterns (RFC 1192)
-    (active, dotdoteq_in_patterns, "1.22.0", Some(28237), None),
-
     // Default match binding modes (RFC 2005)
     (active, match_default_bindings, "1.22.0", Some(42640), None),
 
@@ -553,6 +550,8 @@ declare_features! (
     (accepted, use_nested_groups, "1.25.0", Some(44494), None),
     // a..=b and ..=b
     (accepted, inclusive_range_syntax, "1.26.0", Some(28237), None),
+    // allow `..=` in patterns (RFC 1192)
+    (accepted, dotdoteq_in_patterns, "1.26.0", Some(28237), None),
 );
 
 // If you change this, please modify src/doc/unstable-book as well. You must
@@ -1652,10 +1651,6 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
                 gate_feature_post!(&self, exclusive_range_pattern, pattern.span,
                                    "exclusive range pattern syntax is experimental");
             }
-            PatKind::Range(_, _, RangeEnd::Included(RangeSyntax::DotDotEq)) => {
-                gate_feature_post!(&self, dotdoteq_in_patterns, pattern.span,
-                                   "`..=` syntax in patterns is experimental");
-            }
             PatKind::Paren(..) => {
                 gate_feature_post!(&self, pattern_parentheses, pattern.span,
                                    "parentheses in patterns are unstable");

src/test/run-pass/inc-range-pat.rs

@@ -9,8 +9,6 @@
 // except according to those terms.
 
 // Test old and new syntax for inclusive range patterns.
-#![feature(dotdoteq_in_patterns)]
-
 
 fn main() {
     assert!(match 42 { 0 ... 100 => true, _ => false });