Address review comments

Author: oli-obk

src/librustc_middle/mir/interpret/error.rs

@@ -439,9 +439,6 @@ impl fmt::Debug for UndefinedBehaviorInfo {
 /// to do according to the Rust spec, but due to limitations in the interpreter, the
 /// operation could not be carried out. These limitations can differ between CTFE and the
 /// Miri engine, e.g., CTFE does not support dereferencing pointers at integral addresses.
-///
-/// Currently, we also use this as fall-back error kind for errors that have not been
-/// categorized yet.
 pub enum UnsupportedOpInfo {
     /// Free-form case. Only for errors that are never caught!
     Unsupported(String),
@@ -451,8 +448,9 @@ pub enum UnsupportedOpInfo {
     NoMirFor(DefId),
     /// Encountered a pointer where we needed raw bytes.
     ReadPointerAsBytes,
-
+    //
     // The variants below are only reachable from CTFE/const prop, miri will never emit them.
+    //
     /// Encountered raw bytes where we needed a pointer.
     ReadBytesAsPointer,
 }