Rollup merge of rust-lang#129672 - saethlin:enum-debuginfo-tests, r=Mark-Simulacrum

Make option-like-enum.rs UB-free and portable

Fixes rust-lang#129662

(or, at least the parts of it that aren't rust-lang#128973)

Author: matthiaskrgr

Diff for: tests/debuginfo/option-like-enum.rs

@@ -8,22 +8,22 @@
 // gdb-command:run
 
 // gdb-command:print some
-// gdb-check:$1 = core::option::Option<&u32>::Some(0x12345678)
+// gdb-check:$1 = core::option::Option<&u32>::Some(0x[...])
 
 // gdb-command:print none
 // gdb-check:$2 = core::option::Option<&u32>::None
 
 // gdb-command:print full
-// gdb-check:$3 = option_like_enum::MoreFields::Full(454545, 0x87654321, 9988)
+// gdb-check:$3 = option_like_enum::MoreFields::Full(454545, 0x[...], 9988)
 
-// gdb-command:print empty_gdb.discr
-// gdb-check:$4 = (*mut isize) 0x1
+// gdb-command:print empty
+// gdb-check:$4 = option_like_enum::MoreFields::Empty
 
 // gdb-command:print droid
-// gdb-check:$5 = option_like_enum::NamedFields::Droid{id: 675675, range: 10000001, internals: 0x43218765}
+// gdb-check:$5 = option_like_enum::NamedFields::Droid{id: 675675, range: 10000001, internals: 0x[...]}
 
-// gdb-command:print void_droid_gdb.internals
-// gdb-check:$6 = (*mut isize) 0x1
+// gdb-command:print void_droid
+// gdb-check:$6 = option_like_enum::NamedFields::Void
 
 // gdb-command:print nested_non_zero_yep
 // gdb-check:$7 = option_like_enum::NestedNonZero::Yep(10.5, option_like_enum::NestedNonZeroField {a: 10, b: 20, c: 0x[...]})
@@ -39,19 +39,19 @@
 // lldb-command:run
 
 // lldb-command:v some
-// lldb-check:[...] Some(&0x12345678)
+// lldb-check:[...] Some(&0x[...])
 
 // lldb-command:v none
 // lldb-check:[...] None
 
 // lldb-command:v full
-// lldb-check:[...] Full(454545, &0x87654321, 9988)
+// lldb-check:[...] Full(454545, &0x[...], 9988)
 
 // lldb-command:v empty
 // lldb-check:[...] Empty
 
 // lldb-command:v droid
-// lldb-check:[...] Droid { id: 675675, range: 10000001, internals: &0x43218765 }
+// lldb-check:[...] Droid { id: 675675, range: 10000001, internals: &0x[...] }
 
 // lldb-command:v void_droid
 // lldb-check:[...] Void
@@ -76,11 +76,6 @@
 // contains a non-nullable pointer, then this value is used as the discriminator.
 // The test cases in this file make sure that something readable is generated for
 // this kind of types.
-// If the non-empty variant contains a single non-nullable pointer than the whole
-// item is represented as just a pointer and not wrapped in a struct.
-// Unfortunately (for these test cases) the content of the non-discriminant fields
-// in the null-case is not defined. So we just read the discriminator field in
-// this case (by casting the value to a memory-equivalent struct).
 
 enum MoreFields<'a> {
     Full(u32, &'a isize, i16),
@@ -120,32 +115,26 @@ fn main() {
     let some_str: Option<&'static str> = Some("abc");
     let none_str: Option<&'static str> = None;
 
-    let some: Option<&u32> = Some(unsafe { std::mem::transmute(0x12345678_usize) });
+    let some: Option<&u32> = Some(&1234);
     let none: Option<&u32> = None;
 
-    let full = MoreFields::Full(454545, unsafe { std::mem::transmute(0x87654321_usize) }, 9988);
-
+    let full = MoreFields::Full(454545, &1234, 9988);
     let empty = MoreFields::Empty;
-    let empty_gdb: &MoreFieldsRepr = unsafe { std::mem::transmute(&MoreFields::Empty) };
 
     let droid = NamedFields::Droid {
         id: 675675,
         range: 10000001,
-        internals: unsafe { std::mem::transmute(0x43218765_usize) }
+        internals: &1234,
     };
-
     let void_droid = NamedFields::Void;
-    let void_droid_gdb: &NamedFieldsRepr = unsafe { std::mem::transmute(&NamedFields::Void) };
 
-    let x = 'x';
     let nested_non_zero_yep = NestedNonZero::Yep(
         10.5,
         NestedNonZeroField {
             a: 10,
             b: 20,
-            c: &x
+            c: &'x',
         });
-
     let nested_non_zero_nope = NestedNonZero::Nope;
 
     zzz(); // #break