diff --git a/toolchain/check/testdata/interface/no_prelude/fail_assoc_const_not_constant.carbon b/toolchain/check/testdata/interface/no_prelude/fail_assoc_const_not_constant.carbon
index eee7fecfa983..3a9ab24ee186 100644
--- a/toolchain/check/testdata/interface/no_prelude/fail_assoc_const_not_constant.carbon
+++ b/toolchain/check/testdata/interface/no_prelude/fail_assoc_const_not_constant.carbon
@@ -2,6 +2,8 @@
 // Exceptions. See /LICENSE for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
+// EXTRA-ARGS: --no-dump-sem-ir
+//
 // AUTOUPDATE
 // TIP: To test this file alone, run:
 // TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interface/no_prelude/fail_assoc_const_not_constant.carbon
@@ -9,15 +11,11 @@
 // TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/no_prelude/fail_assoc_const_not_constant.carbon
 
 interface I {
-  // CHECK:STDERR: fail_assoc_const_not_constant.carbon:[[@LINE+8]]:10: error: `Core.Int` implicitly referenced here, but package `Core` not found [CoreNotFound]
-  // CHECK:STDERR:   let a: i32;
-  // CHECK:STDERR:          ^~~
-  // CHECK:STDERR:
   // CHECK:STDERR: fail_assoc_const_not_constant.carbon:[[@LINE+4]]:7: error: pattern in associated constant declaration must be a single `:!` binding [ExpectedSymbolicBindingInAssociatedConstant]
-  // CHECK:STDERR:   let a: i32;
+  // CHECK:STDERR:   let a: {.b: ()};
   // CHECK:STDERR:       ^
   // CHECK:STDERR:
-  let a: i32;
+  let a: {.b: ()};
 }
 
 // We shouldn't issue further errors on uses of the invalid name.
@@ -25,37 +23,3 @@ alias UseA = I.a;
 
 // Ideally we would still diagnose this, but it's OK that we don't.
 alias UseOther = I.other;
-
-// CHECK:STDOUT: --- fail_assoc_const_not_constant.carbon
-// CHECK:STDOUT:
-// CHECK:STDOUT: constants {
-// CHECK:STDOUT:   %I.type: type = facet_type <@I> [concrete]
-// CHECK:STDOUT:   %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: file {
-// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
-// CHECK:STDOUT:     .I = %I.decl
-// CHECK:STDOUT:     .UseA = %UseA
-// CHECK:STDOUT:     .UseOther = %UseOther
-// CHECK:STDOUT:   }
-// CHECK:STDOUT:   %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
-// CHECK:STDOUT:   %I.ref.loc24: type = name_ref I, %I.decl [concrete = constants.%I.type]
-// CHECK:STDOUT:   %a.ref: <error> = name_ref a, <unexpected>.inst19.loc20_7 [concrete = <error>]
-// CHECK:STDOUT:   %UseA: <error> = bind_alias UseA, <unexpected>.inst19.loc20_7 [concrete = <error>]
-// CHECK:STDOUT:   %I.ref.loc27: type = name_ref I, %I.decl [concrete = constants.%I.type]
-// CHECK:STDOUT:   %other.ref: <error> = name_ref other, <error> [concrete = <error>]
-// CHECK:STDOUT:   %UseOther: <error> = bind_alias UseOther, <error> [concrete = <error>]
-// CHECK:STDOUT: }
-// CHECK:STDOUT:
-// CHECK:STDOUT: interface @I {
-// CHECK:STDOUT:   %Self: %I.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self]
-// CHECK:STDOUT:
-// CHECK:STDOUT: !members:
-// CHECK:STDOUT:   .Self = %Self
-// CHECK:STDOUT:   .a = <unexpected>.inst19.loc20_7
-// CHECK:STDOUT:   .other = <poisoned>
-// CHECK:STDOUT:   has_error
-// CHECK:STDOUT:   witness = ()
-// CHECK:STDOUT: }
-// CHECK:STDOUT: