eagerUnfoldingIssue.lean:6:2-6:17: error: failed to synthesize
  MonadLog (StateM Nat)
Additional diagnostic information may be available using the `set_option diagnostics true` command.
eagerUnfoldingIssue.lean:12:2-12:17: error: failed to synthesize
  MonadLog (StateM Nat)
Additional diagnostic information may be available using the `set_option diagnostics true` command.