var a : Type

type List(a : Type)

op nil : List a

op head : List a -> a

op snoc : List a -> a --> List a

forall x : a

. snoc nil x = snoc nil x

. head nil x = x

%% Type Constructors -----------------------------------------------------

List : Type -> Type

%% Type Variables --------------------------------------------------------

a : Type %(var_1)%

%% Assumptions -----------------------------------------------------------

head : forall a : Type . List a -> a %(op)%

nil : forall a : Type . List a %(op)%

snoc : forall a : Type . List a -> a --> List a %(op)%

%% Variables -------------------------------------------------------------

x : a

%% Sentences -------------------------------------------------------------

snoc nil x = snoc nil x

head nil x = x

%% Diagnostics -----------------------------------------------------------

### Hint 1.5, is type variable 'a'

### Hint 2.11, rebound type variable 'a'

### Hint 6.9, not a class 'a'