Start work on recognizing impossible patterns

cli/src/error.rs

@@ -70,6 +70,10 @@ impl<'a> From<QueryError> for Error {
                 "Query error on line {}. Invalid syntax:\n{}",
                 row, l
             )),
+            QueryError::Pattern(row, l) => Error::new(format!(
+                "Query error on line {}. Impossible pattern:\n{}",
+                row, l
+            )),
             QueryError::Predicate(p) => Error::new(format!("Query error: {}", p)),
         }
     }