diff --git a/src/librustc_middle/mir/interpret/error.rs b/src/librustc_middle/mir/interpret/error.rs
index ddff9a57818..f058d17a9bf 100644
--- a/src/librustc_middle/mir/interpret/error.rs
+++ b/src/librustc_middle/mir/interpret/error.rs
@@ -305,7 +305,7 @@ impl fmt::Debug for InvalidProgramInfo<'_> {
             Layout(ref err) => write!(f, "{}", err),
             TransmuteSizeDiff(from_ty, to_ty) => write!(
                 f,
-                "transmuting from {:?} to {:?}, which do not have the same size",
+                "transmuting `{}` to `{}` is not possible, because these types do not have the same size",
                 from_ty, to_ty
             ),
         }
@@ -464,7 +464,7 @@ impl fmt::Debug for UnsupportedOpInfo {
             ReadForeignStatic(did) => {
                 write!(f, "cannot read from foreign (extern) static {:?}", did)
             }
-            NoMirFor(did) => write!(f, "cannot load MIR for {:?}", did),
+            NoMirFor(did) => write!(f, "no MIR body is available for {:?}", did),
             ReadPointerAsBytes => write!(f, "unable to turn pointer into raw bytes",),
             ReadBytesAsPointer => write!(f, "unable to turn bytes into a pointer"),
         }
diff --git a/src/test/ui/consts/transmute-size-mismatch-before-typeck.stderr b/src/test/ui/consts/transmute-size-mismatch-before-typeck.stderr
index 0e55d299c40..b4970c82adb 100644
--- a/src/test/ui/consts/transmute-size-mismatch-before-typeck.stderr
+++ b/src/test/ui/consts/transmute-size-mismatch-before-typeck.stderr
@@ -4,7 +4,7 @@ error: any use of this value will cause an error
 LL | const ZST: &[u8] = unsafe { std::mem::transmute(1usize) };
    | ----------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^---
    |                             |
-   |                             transmuting from usize to &[u8], which do not have the same size
+   |                             transmuting `usize` to `&[u8]` is not possible, because these types do not have the same size
    |
    = note: `#[deny(const_err)]` on by default