Consolidate exhaustiveness-related tests

compiler/rustc_mir_build/src/thir/pattern/_match.rs

@@ -3,6 +3,7 @@
 //!     - ui/or-patterns
 //!     - ui/consts/const_in_pattern
 //!     - ui/rfc-2008-non-exhaustive
+//!     - ui/half-open-range-patterns
 //!     - probably many others
 //! I (Nadrieril) prefer to put new tests in `ui/pattern/usefulness` unless there's a specific
 //! reason not to, for example if they depend on a particular feature like or_patterns.

src/test/ui/feature-gates/feature-gate-precise_pointer_size_matching.rs

@@ -1,14 +1,19 @@
-#![feature(exclusive_range_pattern)]
-
-use std::usize::MAX;
+use std::{isize, usize};
 
 fn main() {
-    match 0usize { //~ERROR non-exhaustive patterns: `_` not covered
-        0..=MAX => {}
+    match 0usize {
+        //~^ ERROR non-exhaustive patterns: `_` not covered
+        //~| NOTE pattern `_` not covered
+        //~| NOTE the matched value is of type `usize`
+        //~| NOTE `usize` does not have a fixed maximum value
+        0..=usize::MAX => {}
     }
 
-    match 0isize { //~ERROR non-exhaustive patterns: `_` not covered
-        1..=20 => {}
-        -5..3 => {}
+    match 0isize {
+        //~^ ERROR non-exhaustive patterns: `_` not covered
+        //~| NOTE pattern `_` not covered
+        //~| NOTE the matched value is of type `isize`
+        //~| NOTE `isize` does not have a fixed maximum value
+        isize::MIN..=isize::MAX => {}
     }
 }

src/test/ui/feature-gates/feature-gate-precise_pointer_size_matching.stderr

@@ -1,5 +1,5 @@
 error[E0004]: non-exhaustive patterns: `_` not covered
-  --> $DIR/feature-gate-precise_pointer_size_matching.rs:6:11
+  --> $DIR/feature-gate-precise_pointer_size_matching.rs:4:11
    |
 LL |     match 0usize {
    |           ^^^^^^ pattern `_` not covered
@@ -10,7 +10,7 @@ LL |     match 0usize {
    = help: add `#![feature(precise_pointer_size_matching)]` to the crate attributes to enable precise `usize` matching
 
 error[E0004]: non-exhaustive patterns: `_` not covered
-  --> $DIR/feature-gate-precise_pointer_size_matching.rs:10:11
+  --> $DIR/feature-gate-precise_pointer_size_matching.rs:12:11
    |
 LL |     match 0isize {
    |           ^^^^^^ pattern `_` not covered

src/test/ui/pattern/usefulness/non-exhaustive-float-range-match.rs → src/test/ui/pattern/usefulness/floats.rs

@@ -10,4 +10,10 @@ fn main() {
     match 0.0 { //~ ERROR non-exhaustive patterns
       0.0..=1.0 => {}
     }
+
+    match 1.0f64 {
+      0.01f64 ..= 6.5f64 => {}
+      0.02f64 => {} //~ ERROR unreachable pattern
+      _ => {}
+    };
 }