diff --git a/src/test/ui/issues/issue-48131.stderr b/src/test/ui/issues/issue-48131.mir.stderr
similarity index 81%
rename from src/test/ui/issues/issue-48131.stderr
rename to src/test/ui/issues/issue-48131.mir.stderr
index 5acc4f16e9fc2..6817e8830c509 100644
--- a/src/test/ui/issues/issue-48131.stderr
+++ b/src/test/ui/issues/issue-48131.mir.stderr
@@ -1,17 +1,17 @@
 error: unnecessary `unsafe` block
-  --> $DIR/issue-48131.rs:9:9
+  --> $DIR/issue-48131.rs:12:9
    |
 LL |         unsafe { /* unnecessary */ }
    |         ^^^^^^ unnecessary `unsafe` block
    |
 note: the lint level is defined here
-  --> $DIR/issue-48131.rs:3:9
+  --> $DIR/issue-48131.rs:6:9
    |
 LL | #![deny(unused_unsafe)]
    |         ^^^^^^^^^^^^^
 
 error: unnecessary `unsafe` block
-  --> $DIR/issue-48131.rs:20:13
+  --> $DIR/issue-48131.rs:23:13
    |
 LL |             unsafe { /* unnecessary */ }
    |             ^^^^^^ unnecessary `unsafe` block
diff --git a/src/test/ui/issues/issue-48131.rs b/src/test/ui/issues/issue-48131.rs
index 85664e62eaded..df98547084d69 100644
--- a/src/test/ui/issues/issue-48131.rs
+++ b/src/test/ui/issues/issue-48131.rs
@@ -1,3 +1,6 @@
+// revisions: mir thir
+// [thir]compile-flags: -Z thir-unsafeck
+
 // This note is annotated because the purpose of the test
 // is to ensure that certain other notes are not generated.
 #![deny(unused_unsafe)] //~ NOTE
diff --git a/src/test/ui/issues/issue-48131.thir.stderr b/src/test/ui/issues/issue-48131.thir.stderr
new file mode 100644
index 0000000000000..6817e8830c509
--- /dev/null
+++ b/src/test/ui/issues/issue-48131.thir.stderr
@@ -0,0 +1,20 @@
+error: unnecessary `unsafe` block
+  --> $DIR/issue-48131.rs:12:9
+   |
+LL |         unsafe { /* unnecessary */ }
+   |         ^^^^^^ unnecessary `unsafe` block
+   |
+note: the lint level is defined here
+  --> $DIR/issue-48131.rs:6:9
+   |
+LL | #![deny(unused_unsafe)]
+   |         ^^^^^^^^^^^^^
+
+error: unnecessary `unsafe` block
+  --> $DIR/issue-48131.rs:23:13
+   |
+LL |             unsafe { /* unnecessary */ }
+   |             ^^^^^^ unnecessary `unsafe` block
+
+error: aborting due to 2 previous errors
+
diff --git a/src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.stderr b/src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.mir.stderr
similarity index 69%
rename from src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.stderr
rename to src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.mir.stderr
index 0dba8496efd39..6810132686124 100644
--- a/src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.stderr
+++ b/src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.mir.stderr
@@ -1,11 +1,11 @@
 error: unnecessary `unsafe` block
-  --> $DIR/unsafe-around-compiler-generated-unsafe.rs:6:5
+  --> $DIR/unsafe-around-compiler-generated-unsafe.rs:9:5
    |
 LL |     unsafe { println!("foo"); }
    |     ^^^^^^ unnecessary `unsafe` block
    |
 note: the lint level is defined here
-  --> $DIR/unsafe-around-compiler-generated-unsafe.rs:3:9
+  --> $DIR/unsafe-around-compiler-generated-unsafe.rs:6:9
    |
 LL | #![deny(unused_unsafe)]
    |         ^^^^^^^^^^^^^
diff --git a/src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.rs b/src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.rs
index 817939e0757b3..08801f9ef59ff 100644
--- a/src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.rs
+++ b/src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.rs
@@ -1,5 +1,8 @@
 // issue #12418
 
+// revisions: mir thir
+// [thir]compile-flags: -Z thir-unsafeck
+
 #![deny(unused_unsafe)]
 
 fn main() {
diff --git a/src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.thir.stderr b/src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.thir.stderr
new file mode 100644
index 0000000000000..6810132686124
--- /dev/null
+++ b/src/test/ui/unsafe/unsafe-around-compiler-generated-unsafe.thir.stderr
@@ -0,0 +1,14 @@
+error: unnecessary `unsafe` block
+  --> $DIR/unsafe-around-compiler-generated-unsafe.rs:9:5
+   |
+LL |     unsafe { println!("foo"); }
+   |     ^^^^^^ unnecessary `unsafe` block
+   |
+note: the lint level is defined here
+  --> $DIR/unsafe-around-compiler-generated-unsafe.rs:6:9
+   |
+LL | #![deny(unused_unsafe)]
+   |         ^^^^^^^^^^^^^
+
+error: aborting due to previous error
+