Oil could disable dynamic scope and provide explicit syntax to opt-in

[andychu]

Related:

• Oil language syntactic/semantic issues #477 -- semantic issues
• unset should unshadow variables higher on the stack (at least for nonlocals) #706 -- unset builtin
• Implement setref #586 -- setref

---

• for reading, we could have some sigil or prefix?
  • var x = ^outer (prefix ^ is available for use)
  • echo ${^outer}
  • note: this is scope_e.LocalOrGlobalOnly
• for writing, provide setref, which requires that the variable have the -n nameref flag.
  • note: setting globals is done with setglobal

TODO: make sure functions written in this style compose !!

---

research:

• what does Tcl do?
• what does Perl do?

[andychu]

Fully done: http://www.oilshell.org/release/latest/doc/variables.html

[andychu]

https://www.oilshell.org/blog/2021/07/release-0.8.12.html