error: file opened with "truncate" and "read"
  --> $DIR/open_options.rs:15:5
   |
LL |     OpenOptions::new().read(true).truncate(true).open("foo.txt");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `-D clippy::nonsensical-open-options` implied by `-D warnings`

error: file opened with "append" and "truncate"
  --> $DIR/open_options.rs:16:5
   |
LL |     OpenOptions::new().append(true).truncate(true).open("foo.txt");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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

error: the method "create" is called more than once
  --> $DIR/open_options.rs:19:5
   |
LL |     OpenOptions::new().create(true).create(false).open("foo.txt");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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

error: the method "append" is called more than once
  --> $DIR/open_options.rs:21:5
   |
LL |     OpenOptions::new().append(true).append(false).open("foo.txt");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: the method "truncate" is called more than once
  --> $DIR/open_options.rs:22:5
   |
LL |     OpenOptions::new().truncate(true).truncate(false).open("foo.txt");
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 7 previous errors