Revert "pre-expansion gate exclusive_range_pattern"

This reverts commit 665a876e30.

src/libsyntax/feature_gate/check.rs

@@ -3,8 +3,9 @@ use super::accepted::ACCEPTED_FEATURES;
 use super::removed::{REMOVED_FEATURES, STABLE_REMOVED_FEATURES};
 use super::builtin_attrs::{AttributeGate, BUILTIN_ATTRIBUTE_MAP};
 
-use crate::ast::{self, NodeId, PatKind, VariantData};
+use crate::ast::{self, NodeId, PatKind, RangeEnd, VariantData};
 use crate::attr::{self, check_builtin_attribute};
+use crate::source_map::Spanned;
 use crate::edition::{ALL_EDITIONS, Edition};
 use crate::visit::{self, FnKind, Visitor};
 use crate::parse::token;
@@ -551,6 +552,10 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
                     }
                 }
             }
+            PatKind::Range(_, _, Spanned { node: RangeEnd::Excluded, .. }) => {
+                gate_feature_post!(&self, exclusive_range_pattern, pattern.span,
+                                   "exclusive range pattern syntax is experimental");
+            }
             _ => {}
         }
         visit::walk_pat(self, pattern)

src/test/ui/feature-gates/feature-gate-exclusive-range-pattern.rs

@@ -1,10 +1,6 @@
-#[cfg(FALSE)]
-fn foo() {
+pub fn main() {
     match 22 {
         0 .. 3 => {} //~ ERROR exclusive range pattern syntax is experimental
-        PATH .. 3 => {} //~ ERROR exclusive range pattern syntax is experimental
         _ => {}
     }
 }
-
-fn main() {}

src/test/ui/feature-gates/feature-gate-exclusive-range-pattern.stderr

@@ -1,21 +1,12 @@
 error[E0658]: exclusive range pattern syntax is experimental
-  --> $DIR/feature-gate-exclusive-range-pattern.rs:4:11
+  --> $DIR/feature-gate-exclusive-range-pattern.rs:3:9
    |
 LL |         0 .. 3 => {}
-   |           ^^
+   |         ^^^^^^
    |
    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
 
-error[E0658]: exclusive range pattern syntax is experimental
-  --> $DIR/feature-gate-exclusive-range-pattern.rs:5:14
-   |
-LL |         PATH .. 3 => {}
-   |              ^^
-   |
-   = note: for more information, see https://github.com/rust-lang/rust/issues/37854
-   = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
-
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
 For more information about this error, try `rustc --explain E0658`.

src/test/ui/parser/pat-tuple-4.rs

@@ -4,6 +4,7 @@ fn main() {
     match 0 {
         (.. PAT) => {}
         //~^ ERROR `..X` range patterns are not supported
+        //~| ERROR exclusive range pattern syntax is experimental
     }
 }
 

src/test/ui/parser/pat-tuple-4.stderr

@@ -4,8 +4,17 @@ error: `..X` range patterns are not supported
 LL |         (.. PAT) => {}
    |          ^^^^^^ help: try using the minimum value for the type: `MIN..PAT`
 
+error[E0658]: exclusive range pattern syntax is experimental
+  --> $DIR/pat-tuple-4.rs:5:10
+   |
+LL |         (.. PAT) => {}
+   |          ^^^^^^
+   |
+   = note: for more information, see https://github.com/rust-lang/rust/issues/37854
+   = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable
+
 error[E0308]: mismatched types
-  --> $DIR/pat-tuple-4.rs:10:30
+  --> $DIR/pat-tuple-4.rs:11:30
    |
 LL | const RECOVERY_WITNESS: () = 0;
    |                              ^ expected (), found integer
@@ -13,6 +22,7 @@ LL | const RECOVERY_WITNESS: () = 0;
    = note: expected type `()`
               found type `{integer}`
 
-error: aborting due to 2 previous errors
+error: aborting due to 3 previous errors
 
-For more information about this error, try `rustc --explain E0308`.
+Some errors have detailed explanations: E0308, E0658.
+For more information about an error, try `rustc --explain E0308`.

src/test/ui/parser/pat-tuple-5.stderr

@@ -5,10 +5,10 @@ LL |         (PAT ..) => {}
    |          ^^^^^^ help: try using the maximum value for the type: `PAT..MAX`
 
 error[E0658]: exclusive range pattern syntax is experimental
-  --> $DIR/pat-tuple-5.rs:5:14
+  --> $DIR/pat-tuple-5.rs:5:10
    |
 LL |         (PAT ..) => {}
-   |              ^^
+   |          ^^^^^^
    |
    = note: for more information, see https://github.com/rust-lang/rust/issues/37854
    = help: add `#![feature(exclusive_range_pattern)]` to the crate attributes to enable