aty : hol_type

SYNOPSIS
The type variable `:A`.

DESCRIPTION
This name is bound to the HOL type :A.

FAILURE CONDITIONS
Not applicable.

USES
Exploiting the very common type variable :A inside derived rules (e.g. an instantiation list for inst or type_subst) without the inefficiency or inconvenience of calling a quotation parser or explicit constructor.

SEE ALSO
bty, bool_ty.