goals1.lean:9:0: error: unsolved subgoals
A : Type,
a b c : A,
Hab : eq a b,
Hbc : eq b c
⊢ eq b c
goals1.lean:9:0: error: failed to add declaration 'foo' to environment, value has metavariables
remark: set 'formatter.hide_full_terms' to false to see the complete term
  λ (A : Type) (a b c : A) (Hab : …) (Hbc : …),
    ?M_1