error: unnecessary use of `.write(true)` because there is `.append(true)`
  --> $DIR/ineffective_open_options.rs:8:9
   |
LL |         .write(true)
   |         ^^^^^^^^^^^^ help: remove `.write(true)`
   |
   = note: `-D clippy::ineffective-open-options` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::ineffective_open_options)]`

error: unnecessary use of `.write(true)` because there is `.append(true)`
  --> $DIR/ineffective_open_options.rs:16:9
   |
LL |         .write(true)
   |         ^^^^^^^^^^^^ help: remove `.write(true)`

error: aborting due to 2 previous errors