4 files changed, 45 insertions, 24 deletions
diff --git a/compiler/rustc_driver/src/pretty.rs b/compiler/rustc_driver/src/pretty.rs
index 5512bd74453..1544c975838 100644
--- a/compiler/rustc_driver/src/pretty.rs
+++ b/compiler/rustc_driver/src/pretty.rs
@@ -471,21 +471,6 @@ pub fn print_after_hir_lowering<'tcx>(
             format!("{:#?}", krate)
         }),
 
-        ThirTree => {
-            let mut out = String::new();
-            abort_on_err(rustc_typeck::check_crate(tcx), tcx.sess);
-            debug!("pretty printing THIR tree");
-            for did in tcx.body_owners() {
-                let hir = tcx.hir();
-                let body = hir.body(hir.body_owned_by(hir.local_def_id_to_hir_id(did)));
-                let arena = thir::Arena::default();
-                let thir =
-                    thir::build_thir(tcx, ty::WithOptConstParam::unknown(did), &arena, &body.value);
-                let _ = writeln!(out, "{:?}:\n{:#?}\n", did, thir);
-            }
-            out
-        }
-
         _ => unreachable!(),
     };
 
@@ -501,18 +486,40 @@ fn print_with_analysis(
     ppm: PpMode,
     ofile: Option<&Path>,
 ) -> Result<(), ErrorReported> {
-    let mut out = Vec::new();
-
     tcx.analysis(LOCAL_CRATE)?;
 
-    match ppm {
-        Mir => write_mir_pretty(tcx, None, &mut out).unwrap(),
-        MirCFG => write_mir_graphviz(tcx, None, &mut out).unwrap(),
+    let out = match ppm {
+        Mir => {
+            let mut out = Vec::new();
+            write_mir_pretty(tcx, None, &mut out).unwrap();
+            String::from_utf8(out).unwrap()
+        }
+
+        MirCFG => {
+            let mut out = Vec::new();
+            write_mir_graphviz(tcx, None, &mut out).unwrap();
+            String::from_utf8(out).unwrap()
+        }
+
+        ThirTree => {
+            let mut out = String::new();
+            abort_on_err(rustc_typeck::check_crate(tcx), tcx.sess);
+            debug!("pretty printing THIR tree");
+            for did in tcx.body_owners() {
+                let hir = tcx.hir();
+                let body = hir.body(hir.body_owned_by(hir.local_def_id_to_hir_id(did)));
+                let arena = thir::Arena::default();
+                let thir =
+                    thir::build_thir(tcx, ty::WithOptConstParam::unknown(did), &arena, &body.value);
+                let _ = writeln!(out, "{:?}:\n{:#?}\n", did, thir);
+            }
+            out
+        }
+
         _ => unreachable!(),
-    }
+    };
 
-    let out = std::str::from_utf8(&out).unwrap();
-    write_or_print(out, ofile);
+    write_or_print(&out, ofile);
 
     Ok(())
 }
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index c1be90efc72..f98c8a7916e 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -2293,7 +2293,7 @@ impl PpMode {
 
     pub fn needs_analysis(&self) -> bool {
         use PpMode::*;
-        matches!(*self, Mir | MirCFG)
+        matches!(*self, Mir | MirCFG | ThirTree)
     }
 }
 
diff --git a/src/test/ui/issues/issue-83048.rs b/src/test/ui/issues/issue-83048.rs
new file mode 100644
index 00000000000..520ae974398
--- /dev/null
+++ b/src/test/ui/issues/issue-83048.rs
@@ -0,0 +1,5 @@
+// compile-flags: -Z unpretty=thir-tree
+
+pub fn main() {
+    break; //~ ERROR: `break` outside of a loop [E0268]
+}
diff --git a/src/test/ui/issues/issue-83048.stderr b/src/test/ui/issues/issue-83048.stderr
new file mode 100644
index 00000000000..62d67d75844
--- /dev/null
+++ b/src/test/ui/issues/issue-83048.stderr
@@ -0,0 +1,9 @@
+error[E0268]: `break` outside of a loop
+  --> $DIR/issue-83048.rs:4:5
+   |
+LL |     break;
+   |     ^^^^^ cannot `break` outside of a loop
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0268`.