-invalid suffix in arg argument \`${too_big}h'
-arg argument \`$too_big' too large
-invalid arg argument \`x'
-invalid suffix in arg argument \`9x'
+invalid suffix in X argument \`${too_big}h'
+X argument \`$too_big' too large
+invalid X argument \`x'
+invalid suffix in X argument \`9x'