Calc
Inductive()
Lemma
NewType()
Proof
QExists()
QForAll()
Struct()
axiom()
cond()
define()
prove()
search()
simp()
None_()
Option()
Some()
get()
is_option()
Helper to create Option values >>> Some(42) Some(42) >>> Some(42).sort() Option_Int
x (ExprRef)
DatatypeRef