Auto merge of #4690 - lzutao:fix-test-on-non-amd64, r=phansch

generate stderr file on non x86-64 system

changelog: none

Author: bors

tests/ui/transmute_32bit.rs

@@ -1,6 +1,6 @@
 //ignore-x86_64
 
-#[warn(wrong_transmute)]
+#[warn(clippy::wrong_transmute)]
 fn main() {
     unsafe {
         let _: *const usize = std::mem::transmute(6.0f32);

tests/ui/transmute_32bit.stderr

@@ -0,0 +1,39 @@
+error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
+  --> $DIR/transmute_32bit.rs:6:31
+   |
+LL |         let _: *const usize = std::mem::transmute(6.0f32);
+   |                               ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: source type: `f32` (32 bits)
+   = note: target type: `*const usize` (64 bits)
+
+error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
+  --> $DIR/transmute_32bit.rs:8:29
+   |
+LL |         let _: *mut usize = std::mem::transmute(6.0f32);
+   |                             ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: source type: `f32` (32 bits)
+   = note: target type: `*mut usize` (64 bits)
+
+error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
+  --> $DIR/transmute_32bit.rs:10:31
+   |
+LL |         let _: *const usize = std::mem::transmute('x');
+   |                               ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: source type: `char` (32 bits)
+   = note: target type: `*const usize` (64 bits)
+
+error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
+  --> $DIR/transmute_32bit.rs:12:29
+   |
+LL |         let _: *mut usize = std::mem::transmute('x');
+   |                             ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: source type: `char` (32 bits)
+   = note: target type: `*mut usize` (64 bits)
+
+error: aborting due to 4 previous errors
+
+For more information about this error, try `rustc --explain E0512`.