tree b289a8af0c0497f2555784a0cf666659ceab0236
parent 6e9b719694bffb8de711f182d405ec37d32ae0b1
author Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1540834008 -0300
committer Roberto Ierusalimschy <roberto@inf.puc-rio.br> 1540834008 -0300

Big revamp in the implmentation of labels/gotos

Added restriction that, when a label is created, there cannot be
another label with the same name visible. That allows backward goto's
to be resolved when they are read. Backward goto's get a close if
they jump out of the scope of some variable; labels get a close only
if previous goto to it jumps out of the scope of some upvalue.