BUG: variable self reference causes stack overflow

[daz10000]

This (admittedly buggy) GSL causes a stack overflow on our production compiler. Please verify of course but pretty sure it's a bug in GslCore

let x = oGAL1

let y = &y ; &x

[chrismacklin]

There is a primitive check to handle the simple case

let x = &x

here: https://github.com/Amyris/GslCore/blob/c9ae9242ebc0b7cad10555370da846e4bbf727b7/src/GslCore/AstTypes.fs#L474

Expanding this active pattern could be a fine place to start to handle this case. It is tricky, though.