Feature gate *all* slice patterns. #23121

Until some backwards-compatibility hazards are fixed in #23121,
these need to be unstable.

[breaking-change]

Author: brson

src/doc/reference.md

@@ -40,6 +40,7 @@
 #![feature(step_by)]
 #![feature(str_char)]
 #![feature(convert)]
+#![feature(slice_patterns)]
 #![cfg_attr(test, feature(rand, rustc_private, test, hash, collections))]
 #![cfg_attr(test, allow(deprecated))] // rand
 

src/doc/trpl/patterns.md

@@ -26,6 +26,7 @@
 #![feature(debug_builders)]
 #![feature(unique)]
 #![feature(step_by)]
+#![feature(slice_patterns)]
 #![allow(deprecated)] // rand
 
 extern crate core;

src/libcollections/lib.rs

@@ -45,6 +45,7 @@
 #![feature(str_char)]
 #![feature(convert)]
 #![feature(into_cow)]
+#![feature(slice_patterns)]
 #![cfg_attr(test, feature(test))]
 
 #![allow(trivial_casts)]

src/libcoretest/lib.rs

@@ -39,6 +39,7 @@
 #![feature(path_ext)]
 #![feature(path_relative_from)]
 #![feature(convert)]
+#![feature(slice_patterns)]
 
 extern crate arena;
 extern crate getopts;

src/librustc/lib.rs

@@ -129,6 +129,7 @@
 #![feature(allow_internal_unstable)]
 #![feature(str_char)]
 #![feature(into_cow)]
+#![feature(slice_patterns)]
 #![cfg_attr(test, feature(test, rustc_private, std_misc))]
 
 // Don't link to std. We are std.

src/librustdoc/lib.rs

@@ -153,6 +153,9 @@ const KNOWN_FEATURES: &'static [(&'static str, &'static str, Status)] = &[
     // below (it has to be checked before expansion possibly makes
     // macros disappear).
     ("allow_internal_unstable", "1.0.0", Active),
+
+    // #23121. Array patterns have some hazards yet.
+    ("slice_patterns", "1.0.0", Active),
 ];
 // (changing above list without updating src/doc/reference.md makes @cmr sad)
 
@@ -694,6 +697,11 @@ impl<'a, 'v> Visitor<'v> for PostExpansionVisitor<'a> {
                                    but at the end of a slice (e.g. \
                                    `[0, ..xs, 0]` are experimental")
             }
+            ast::PatVec(..) => {
+                self.gate_feature("slice_patterns",
+                                  pattern.span,
+                                  "slice pattern syntax is experimental");
+            }
             ast::PatBox(..) => {
                 self.gate_feature("box_patterns",
                                   pattern.span,

src/libstd/lib.rs

@@ -41,6 +41,7 @@
 #![feature(str_char)]
 #![feature(convert)]
 #![feature(into_cow)]
+#![feature(slice_patterns)]
 
 extern crate arena;
 extern crate fmt_macros;

src/libsyntax/feature_gate.rs

@@ -12,6 +12,7 @@
 
 #![crate_type="dylib"]
 #![feature(plugin_registrar, rustc_private)]
+#![feature(slice_patterns)]
 
 extern crate syntax;
 extern crate rustc;