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:

GslCore/src/GslCore/AstTypes.fs

Line 474 in c9ae924

let (|SelfReferentialVariable|_|) node =

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