Reword

spec/compiler/parser/parser_spec.cr

@@ -1122,7 +1122,7 @@ module Crystal
     it_parses "$~ = 1", Assign.new("$~".var, 1.int32)
 
     assert_syntax_error "$2147483648"
-    assert_syntax_error "$99999999999999999999999?", "Regex capture index 99999999999999999999999 doesn't fit in an Int32"
+    assert_syntax_error "$99999999999999999999999?", "Index $99999999999999999999999 doesn't fit in an Int32"
 
     it_parses "foo /a/", Call.new(nil, "foo", regex("a"))
     it_parses "foo(/a/)", Call.new(nil, "foo", regex("a"))

src/compiler/crystal/syntax/parser.cr

@@ -998,7 +998,7 @@ module Crystal
         end
         location = @token.location
         index = value.to_i?
-        raise "Regex capture index #{value} doesn't fit in an Int32" unless index
+        raise "Index $#{value} doesn't fit in an Int32" unless index
         node_and_next_token Call.new(Global.new("$~").at(location), method, NumberLiteral.new(index))
       when :__LINE__
         node_and_next_token MagicConstant.expand_line_node(@token.location)