Multiple RETURNING clauses in a SQL function

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Goal Find SQL functions that have multiple statements with the RETURNING clause.
Notes The query excludes routines that only have multiple RETURNING within one statement.
Type Problem detection (Each row in the result could represent a flaw in the design)
Reliability High (Few or no false-positive results)
License MIT License
Fixing Suggestion Think through the order of statements in the function and what should be the returned value. Remove all the RETURNING clauses except one.
Data Source INFORMATION_SCHEMA+system catalog
SQL Query 
SELECT 
  n.nspname AS func_schema, 
  pr.proname AS func_name, 
   pg_get_function_identity_arguments(pr.oid) AS parameters,
   t.typname AS return_type,
  regexp_replace(pg_get_functiondef(pr.oid),'[\r\n]','
','g')  AS func_src
FROM 
  pg_catalog.pg_proc pr, 
  pg_catalog.pg_namespace n,
  pg_catalog.pg_language l,
  pg_catalog.pg_type t
WHERE 
  pr.pronamespace = n.oid 
  AND pr.prolang=l.oid 
  AND pr.prorettype=t.oid 
  AND pr.prokind='f' 
  AND l.lanname='sql' 
  AND pg_get_functiondef(pr.oid)~*'RETURNING[[:space:]].*[;].*RETURNING[[:space:]]'   
AND n.nspname NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
ORDER BY func_schema, func_name, parameters;
Collections

This query belongs to the following collections:

NameDescription
Find problems automaticallyQueries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .
Categories

This query is classified under the following categories:

NameDescription
User-defined routinesQueries of this category provide information about the user-defined routines