[firebird-support] Firebird 4 and RDB$ERROR

[sbai...@mutualconsultants.ltd.uk [firebird-support]]

I am using Firebird 4.0 Beta 1. The release notes describe a new system 
function RDB$ERROR:
 "The function RDB$ERROR() takes a PSQL error context as input and returns the 
specific context of the active
exception. Its scope is confined to the context of the exception-handling block 
in PSQL. Outside the exception
handling block, RDB$ERROR always returns NULL"  To test this in iSQL I have 
tried: select rdb$error(gdscode) from rdb$database

 

 This results in:
 Statement failed, SQLSTATE = 42000
 Dynamic SQL Error
 -SQL error code = -104
 -Token unknown
 -GDSCODE
 

 I was expecting NULL to be returned. Have I misunderstood?