D-Programming-Language/phobos — pull request #2217 by tom-tan (2014-05-31 13:35:18+00:00)
Title: Mark std.stdio.LockingTextWriter.this, ~this and this(this) as @trusted

They use an unsafe function `FLOCK` or `FUNLOCK` but we can verify that they can be trusted.
`LockingTextWriter.this` uses unsafe cast from `FILE*` to `_iobuf*` but it can be trusted.