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error: file opened with `truncate` and `read`
  --> $DIR/open_options.rs:6:5
   |
LL |     OpenOptions::new().read(true).truncate(true).open("foo.txt");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D clippy::nonsensical-open-options` implied by `-D warnings`
   = help: to override `-D warnings` add `#[allow(clippy::nonsensical_open_options)]`

error: file opened with `append` and `truncate`
  --> $DIR/open_options.rs:9:5
   |
LL |     OpenOptions::new().append(true).truncate(true).open("foo.txt");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the method `read` is called more than once
  --> $DIR/open_options.rs:12:5
   |
LL |     OpenOptions::new().read(true).read(false).open("foo.txt");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the method `create` is called more than once
  --> $DIR/open_options.rs:14:5
   |
LL |     OpenOptions::new().create(true).create(false).open("foo.txt");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the method `write` is called more than once
  --> $DIR/open_options.rs:16:5
   |
LL |     OpenOptions::new().write(true).write(false).open("foo.txt");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the method `append` is called more than once
  --> $DIR/open_options.rs:18:5
   |
LL |     OpenOptions::new().append(true).append(false).open("foo.txt");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the method `truncate` is called more than once
  --> $DIR/open_options.rs:20:5
   |
LL |     OpenOptions::new().truncate(true).truncate(false).open("foo.txt");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 7 previous errors