tree e35840847207c850af5262f93f863f583d2af76d
parent e073cbc2e538369e0611abfc9948f301aea6aef3
author Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1541008485 -0300
committer Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1541008485 -0300

State in generic 'for' acts as a to-be-closed variable

The implicit variable 'state' in a generic 'for' is marked as a
to-be-closed variable, so that the state will be closed as soon
as the loop ends, no matter how.

Taking advantage of this new facility, the call 'io.lines(filename)'
now returns the open file as a second result. Therefore,
an iteraction like 'for l in io.lines(name)...' will close the
file even when the loop ends with a break or an error.