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
  λ (A : Type) (a b c : A) (Hab : eq a b) (Hbc : eq b c),
    ?M_1