This pass only allows arguments to be variables.
The resulting language is:
let-expr := (Let symbol <simple-expr> <expr>)
simple-expr: (Int num) | (Var symbol) | (Prim op (list-of-symbols))
expr := let-expr | simple-expr
top-level := let-expr
Notably, every top level expression is assigned to a (temporary) variable.
This subset of CVar is particularly easy to translate into bril IR.
Enrico Lumetti