use one-line pattern matching for warning tests

1 files changed, 2 insertions, 2 deletions

diff --git a/spec/ruby/core/warning/element_set_spec.rb b/spec/ruby/core/warning/element_set_spec.rb
index a6b28282a0..80a47ad6a9 100644
--- a/spec/ruby/core/warning/element_set_spec.rb
+++ b/spec/ruby/core/warning/element_set_spec.rb
@@ -8,8 +8,8 @@ ruby_version_is '2.7' do
     end
 
     it "emits and suppresses warnings for :experimental" do
-      ruby_exe('Warning[:experimental] = true; eval("case 0; in a; end")', args: "2>&1").should =~ /is experimental/
-      ruby_exe('Warning[:experimental] = false; eval("case 0; in a; end")', args: "2>&1").should == ""
+      ruby_exe('Warning[:experimental] = true; eval("1 => a")', args: "2>&1").should =~ /is experimental/
+      ruby_exe('Warning[:experimental] = false; eval("1 => a")', args: "2>&1").should == ""
     end
 
     it "raises for unknown category" do