And also --bless those recovery tests.

src/test/ui/exclusive-range/exclusive_range_pattern_syntax_collision.stderr

@@ -1,8 +1,24 @@
-error: unexpected token: `,`
-  --> $DIR/exclusive_range_pattern_syntax_collision.rs:5:17
+error: `X..` range patterns are not supported
+  --> $DIR/exclusive_range_pattern_syntax_collision.rs:5:13
    |
 LL |         [_, 99.., _] => {},
-   |                 ^
+   |             ^^^^ help: try using the maximum value for the type: `99..MAX`
 
-error: aborting due to previous error
+error: arbitrary expressions aren't allowed in patterns
+  --> $DIR/exclusive_range_pattern_syntax_collision.rs:5:13
+   |
+LL |         [_, 99.., _] => {},
+   |             ^^^^
 
+error[E0029]: only char and numeric types are allowed in range patterns
+  --> $DIR/exclusive_range_pattern_syntax_collision.rs:5:13
+   |
+LL |         [_, 99.., _] => {},
+   |             ^^^^ ranges require char or numeric types
+   |
+   = note: start type: {integer}
+   = note: end type: [type error]
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0029`.

src/test/ui/exclusive-range/exclusive_range_pattern_syntax_collision2.stderr

@@ -1,8 +1,31 @@
-error: unexpected token: `]`
-  --> $DIR/exclusive_range_pattern_syntax_collision2.rs:5:17
+error: `X..` range patterns are not supported
+  --> $DIR/exclusive_range_pattern_syntax_collision2.rs:5:13
    |
 LL |         [_, 99..] => {},
-   |                 ^
+   |             ^^^^ help: try using the maximum value for the type: `99..MAX`
 
-error: aborting due to previous error
+error: arbitrary expressions aren't allowed in patterns
+  --> $DIR/exclusive_range_pattern_syntax_collision2.rs:5:13
+   |
+LL |         [_, 99..] => {},
+   |             ^^^^
 
+error[E0527]: pattern requires 2 elements but array has 3
+  --> $DIR/exclusive_range_pattern_syntax_collision2.rs:5:9
+   |
+LL |         [_, 99..] => {},
+   |         ^^^^^^^^^ expected 3 elements
+
+error[E0029]: only char and numeric types are allowed in range patterns
+  --> $DIR/exclusive_range_pattern_syntax_collision2.rs:5:13
+   |
+LL |         [_, 99..] => {},
+   |             ^^^^ ranges require char or numeric types
+   |
+   = note: start type: {integer}
+   = note: end type: [type error]
+
+error: aborting due to 4 previous errors
+
+Some errors have detailed explanations: E0029, E0527.
+For more information about an error, try `rustc --explain E0029`.

src/test/ui/exclusive-range/exclusive_range_pattern_syntax_collision3.stderr

@@ -1,8 +1,36 @@
-error: expected one of `,` or `]`, found `9`
-  --> $DIR/exclusive_range_pattern_syntax_collision3.rs:5:12
+error: `..X` range patterns are not supported
+  --> $DIR/exclusive_range_pattern_syntax_collision3.rs:5:10
    |
 LL |         [..9, 99..100, _] => {},
-   |            ^ expected one of `,` or `]` here
+   |          ^^^ help: try using the minimum value for the type: `MIN..9`
 
-error: aborting due to previous error
+error: arbitrary expressions aren't allowed in patterns
+  --> $DIR/exclusive_range_pattern_syntax_collision3.rs:5:10
+   |
+LL |         [..9, 99..100, _] => {},
+   |          ^^^
 
+error[E0029]: only char and numeric types are allowed in range patterns
+  --> $DIR/exclusive_range_pattern_syntax_collision3.rs:5:10
+   |
+LL |         [..9, 99..100, _] => {},
+   |          ^^^ ranges require char or numeric types
+   |
+   = note: start type: [type error]
+   = note: end type: {integer}
+
+error[E0308]: mismatched types
+  --> $DIR/exclusive_range_pattern_syntax_collision3.rs:5:15
+   |
+LL |     match [5..4, 99..105, 43..44] {
+   |           ----------------------- this match expression has type `std::ops::Range<{integer}>`
+LL |         [..9, 99..100, _] => {},
+   |               ^^^^^^^ expected struct `std::ops::Range`, found integer
+   |
+   = note: expected type `std::ops::Range<{integer}>`
+              found type `{integer}`
+
+error: aborting due to 4 previous errors
+
+Some errors have detailed explanations: E0029, E0308.
+For more information about an error, try `rustc --explain E0029`.

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

@@ -1,8 +1,40 @@
-error: expected one of `)` or `,`, found `pat`
+error: `..X` range patterns are not supported
+  --> $DIR/pat-tuple-4.rs:3:10
+   |
+LL |         (.. pat) => {}
+   |          ^^^^^^ help: try using the minimum value for the type: `MIN..pat`
+
+error: arbitrary expressions aren't allowed in patterns
+  --> $DIR/pat-tuple-4.rs:3:10
+   |
+LL |         (.. pat) => {}
+   |          ^^^^^^
+
+error[E0425]: cannot find value `pat` in this scope
   --> $DIR/pat-tuple-4.rs:3:13
    |
 LL |         (.. pat) => {}
-   |             ^^^ expected one of `)` or `,` here
+   |             ^^^ not found in this scope
 
-error: aborting due to previous error
+error[E0658]: exclusive range pattern syntax is experimental
+  --> $DIR/pat-tuple-4.rs:3:10
+   |
+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[E0029]: only char and numeric types are allowed in range patterns
+  --> $DIR/pat-tuple-4.rs:3:10
+   |
+LL |         (.. pat) => {}
+   |          ^^^^^^ ranges require char or numeric types
+   |
+   = note: start type: [type error]
+   = note: end type: [type error]
+
+error: aborting due to 5 previous errors
+
+Some errors have detailed explanations: E0029, E0425, E0658.
+For more information about an error, try `rustc --explain E0029`.

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

@@ -1,8 +1,40 @@
-error: unexpected token: `)`
-  --> $DIR/pat-tuple-5.rs:3:16
+error: `X..` range patterns are not supported
+  --> $DIR/pat-tuple-5.rs:3:10
    |
 LL |         (pat ..) => {}
-   |                ^
+   |          ^^^^^^ help: try using the maximum value for the type: `pat..MAX`
 
-error: aborting due to previous error
+error: arbitrary expressions aren't allowed in patterns
+  --> $DIR/pat-tuple-5.rs:3:10
+   |
+LL |         (pat ..) => {}
+   |          ^^^^^^
 
+error[E0425]: cannot find value `pat` in this scope
+  --> $DIR/pat-tuple-5.rs:3:10
+   |
+LL |         (pat ..) => {}
+   |          ^^^ not found in this scope
+
+error[E0658]: exclusive range pattern syntax is experimental
+  --> $DIR/pat-tuple-5.rs:3:10
+   |
+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[E0029]: only char and numeric types are allowed in range patterns
+  --> $DIR/pat-tuple-5.rs:3:10
+   |
+LL |         (pat ..) => {}
+   |          ^^^^^^ ranges require char or numeric types
+   |
+   = note: start type: [type error]
+   = note: end type: [type error]
+
+error: aborting due to 5 previous errors
+
+Some errors have detailed explanations: E0029, E0425, E0658.
+For more information about an error, try `rustc --explain E0029`.