diff --git a/src/librustc_mir/build/mod.rs b/src/librustc_mir/build/mod.rs
index 903c8f8657f3d..942faaaeb97fe 100644
--- a/src/librustc_mir/build/mod.rs
+++ b/src/librustc_mir/build/mod.rs
@@ -591,7 +591,7 @@ fn should_abort_on_panic<'a, 'gcx, 'tcx>(tcx: TyCtxt<'a, 'gcx, 'tcx>,
     // unwind anyway. Don't stop them.
     let attrs = &tcx.get_attrs(fn_def_id);
     match attr::find_unwind_attr(Some(tcx.sess.diagnostic()), attrs) {
-        None => true,
+        None => false, // FIXME(#58794)
         Some(UnwindAttr::Allowed) => false,
         Some(UnwindAttr::Aborts) => true,
     }
diff --git a/src/test/incremental/hashes/function_interfaces.rs b/src/test/incremental/hashes/function_interfaces.rs
index 4330b0025a251..8a0af2b0044a4 100644
--- a/src/test/incremental/hashes/function_interfaces.rs
+++ b/src/test/incremental/hashes/function_interfaces.rs
@@ -94,7 +94,7 @@ pub unsafe fn make_unsafe() {}
 pub fn make_extern() {}
 
 #[cfg(not(cfail1))]
-#[rustc_clean(cfg = "cfail2", except = "Hir, HirBody, MirBuilt, TypeckTables, FnSignature")]
+#[rustc_clean(cfg = "cfail2", except = "Hir, HirBody, TypeckTables, FnSignature")]
 #[rustc_clean(cfg = "cfail3")]
 pub extern "C" fn make_extern() {}
 
diff --git a/src/test/incremental/hashes/inherent_impls.rs b/src/test/incremental/hashes/inherent_impls.rs
index d1574aee9a9c0..3abc6c4d2e23e 100644
--- a/src/test/incremental/hashes/inherent_impls.rs
+++ b/src/test/incremental/hashes/inherent_impls.rs
@@ -263,7 +263,7 @@ impl Foo {
 #[rustc_clean(cfg="cfail2")]
 #[rustc_clean(cfg="cfail3")]
 impl Foo {
-    #[rustc_clean(cfg="cfail2", except="Hir,HirBody,MirBuilt,FnSignature,TypeckTables")]
+    #[rustc_clean(cfg="cfail2", except="Hir,HirBody,FnSignature,TypeckTables")]
     #[rustc_clean(cfg="cfail3")]
     pub extern fn make_method_extern(&self) { }
 }
diff --git a/src/test/run-pass/abort-on-c-abi.rs b/src/test/run-pass/abort-on-c-abi.rs
index df94cd5718631..c3991bd2e59c8 100644
--- a/src/test/run-pass/abort-on-c-abi.rs
+++ b/src/test/run-pass/abort-on-c-abi.rs
@@ -1,4 +1,5 @@
 #![allow(unused_must_use)]
+#![feature(unwind_attributes)]
 // Since we mark some ABIs as "nounwind" to LLVM, we must make sure that
 // we never unwind through them.
 
@@ -10,6 +11,7 @@ use std::io::prelude::*;
 use std::io;
 use std::process::{Command, Stdio};
 
+#[unwind(aborts)] // FIXME(#58794)
 extern "C" fn panic_in_ffi() {
     panic!("Test");
 }