rustc change: -o no longer ignores the file name.
rustc change: -o no longer ignores the file name.

servo/rust-encoding,jedisct1/rust-encoding,lifthrasiir/rust-encoding,tempbottle/rust-encoding,jedisct1/rust-encoding,lifthrasiir/rust-encoding,tempbottle/rust-encoding,nox/rust-encoding,nox/rust-encoding,tempbottle/rust-encoding,lifthrasiir/rust-encoding,nox/rust-encoding,servo/rust-encoding