Rollup merge of #107146 - compiler-errors:unsizing-params, r=cjgillot

[rust.git] / compiler / rustc_mir_build / src / build / mod.rs

diff --git a/compiler/rustc_mir_build/src/build/mod.rs b/compiler/rustc_mir_build/src/build/mod.rs
index f85831b4fc6b57c106881d557ae3b9e39cceba83..1655e224ddbb5b68f16f9710bdf509f18607d922 100644 (file)
--- a/compiler/rustc_mir_build/src/build/mod.rs
+++ b/compiler/rustc_mir_build/src/build/mod.rs
@@ -439,6 +439,10 @@ fn construct_fn<'tcx>(
     let fn_id = tcx.hir().local_def_id_to_hir_id(fn_def.did);
     let generator_kind = tcx.generator_kind(fn_def.did);
 
+    // The representation of thir for `-Zunpretty=thir-tree` relies on
+    // the entry expression being the last element of `thir.exprs`.
+    assert_eq!(expr.as_usize(), thir.exprs.len() - 1);
+
     // Figure out what primary body this item has.
     let body_id = tcx.hir().body_owned_by(fn_def.did);
     let span_with_body = tcx.hir().span_with_body(fn_id);