checking package dependencies
compiling ENotExpr.bs
Warning: "ENotExpr.bs", line 24, column 8: (P0223)
  Definition of `a' is not used.
Warning: "ENotExpr.bs", line 25, column 8: (P0223)
  Definition of `b' is not used.
Error: "ENotExpr.bs", line 25, column 8: (T0036)
  Last statement in a `do' must be an expression