2 errors occurred while validating:
[1/2] error: unused local variable: `_Foo`
--> main.sml:2:0
     |
   2 | _Foo = 1
     | ^ this variable is not used anywhere, and thus has no effect. either delete or comment it out
[2/2] error: unused local variable: `_Bar`
--> main.sml:3:0
     |
   3 | _Bar = 2
     | ^ this variable is not used anywhere, and thus has no effect. either delete or comment it out