"RETURNS SETOF record LANGUAGE" causes error

[reggi]

CREATE OR REPLACE FUNCTION schema_identifier_split(url_path TEXT, OUT scope TEXT, OUT plugin TEXT, OUT name TEXT, OUT version INT)
RETURNS SETOF record LANGUAGE plpgsql AS $$
DECLARE
  parts TEXT[];
BEGIN
  parts := string_to_array(url_path, '/');
  scope := parts[1];
  plugin := parts[2];
  name := parts[3];
  IF array_length(parts, 1) > 3 THEN
    version := parts[4]::INT;
  ELSE
    version := NULL;
  END IF;
  RETURN NEXT;
END;
$$;

error: Uncaught (in promise) Error: Syntax error at line 2 col 22:

  RETURNS SETOF record LANGUAGE
                       ^
Unexpected word token: "language". I did not expect any more input. Here is the state of my parse table:

    kw_returns → %word ● 
    word → %word ● 
    kw_language → %word ● 
    func_spec$subexpression$2 → word ● 
    func_spec$subexpression$5 → word ● 
    func_spec$subexpression$4 → word ● 
    func_spec$subexpression$3 → word ● 
    func_purity → word ● 

                var err = new Error(this.reportError(token));
                          ^
    at Parser.feed (https://deno.land/x/[email protected]/lib/nearley.js:337:27)
    at _parse (https://deno.land/x/[email protected]/parser.ts:110:16)
    at doParse (https://deno.land/x/[email protected]/parser.ts:57:27)
    at parse (https://deno.land/x/[email protected]/parser.ts:60:11)
    at getSQLFile (file:///Users/thomasreggi/Documents/GitHub/pgrun/mod.ts:35:28)
    at readSqlFile (file:///Users/thomasreggi/Documents/GitHub/pgrun/mod.ts:74:10)
    at eventLoopTick (ext:core/01_core.js:183:11)
    at async Promise.all (index 45)
    at async readSQLFiles (file:///Users/thomasreggi/Documents/GitHub/pgrun/mod.ts:86:17)
    at async organizer (file:///Users/thomasreggi/Documents/GitHub/pgrun/mod.ts:266:17)

[alexporrello]

It seems this is not limited to "LANGUAGE," but rather an issue with SETOF. The following also errors:

RETURNS SETOF refcursor