error: type mismatch: expected type `Array[Boolean]+`, but found type `Array[Boolean]`: cannot coerce empty array value to non-empty array type `Array[Boolean]+`
  ┌─ tests/workflows/non-empty-array-fail/source.wdl:8:30
  │
8 │   Array[Boolean]+ nonempty = x
  │                   --------   ^ this is type `Array[Boolean]`
  │                   │           
  │                   this expects type `Array[Boolean]+`
