BUG #8385: greek symbols as function name

The following bug has been logged on the website:

Bug reference:      8385
Logged by:          Alessio
Email address:      kolmyk@hotmail.com
PostgreSQL version: 9.2.3
Operating system:   Windows 8
Description:

create or replace function α(β int, ξ int, μ float) returns float as $$
select (β + ξ) * μ $$ language sql;
select α(1, 2, 0.1);
-- it works
select ascii(proname), * from pg_proc where length(proname) = 1;
-- return code 60536 although select ascii('α') retruns 945
select * from pg_proc where proname = 'α';
-- returns nothing