Perl 6
SMOP Lexical Scope Implementation: Revision 1
One first hard step in implementing lexical scopes is to put together a lot of details that are spread over the specs. In this page we're going to sketch a model for the lexical scopes that support all the documented Perl 6 features.
^ Variable Lookup
The local variable lookup happens in the following order:
# MY
# OUTER recursive
^ Special cases
^^ $_
$_ is always locally defined in any block. Routines start with an empty $_, other Code objects have a signature of:
.pre
-> $_ is rw = OUTER::<$_>
.pre
^^ $! and $/
These variables are compile time aliases to $+! and $+/
^ Variable Lookup
The local variable lookup happens in the following order:
# MY
# OUTER recursive
^ Special cases
^^ $_
$_ is always locally defined in any block. Routines start with an empty $_, other Code objects have a signature of:
.pre
-> $_ is rw = OUTER::<$_>
.pre
^^ $! and $/
These variables are compile time aliases to $+! and $+/
