tree 41eab6e4d87552e29731db552f7d58d679c56973
parent 7696c6474fe51ed59fee324e78c1233af74febdd
author Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1543514564 -0200
committer Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1543514564 -0200

A to-be-closed variable must have a closable value (or be nil)

It is an error for a to-be-closed variable to have a non-closable
non-nil value when it is being closed. This situation does not seem to
be useful and often hints to an error. (Particularly in the C API, it is
easy to change a to-be-closed index by mistake.)