--
-- Error CONTEXT lines: an error raised while PL/Ruby code runs carries a
-- "CONTEXT: PL/Ruby function ..." line (or the anonymous-block variant),
-- like every other procedural language.
--
CREATE FUNCTION ec_boom() RETURNS int LANGUAGE plruby AS $$
    raise 'kaboom'
$$;
-- The CONTEXT line names the function.
SELECT ec_boom();
ERROR:  kaboom
CONTEXT:  PL/Ruby function "ec_boom"
-- A function reached through spi_exec reports its own frame (the inner
-- error is caught by SPI and re-raised in the caller).
CREATE FUNCTION ec_outer() RETURNS int LANGUAGE plruby AS $$
    spi_exec('SELECT ec_boom()')
    0
$$;
SELECT ec_outer();
ERROR:  kaboom
CONTEXT:  PL/Ruby function "ec_outer"
-- An anonymous DO block reports an anonymous-code-block context.
DO $$ raise 'do boom' $$ LANGUAGE plruby;
ERROR:  do boom
CONTEXT:  PL/Ruby anonymous code block
DROP FUNCTION ec_outer();
DROP FUNCTION ec_boom();