Cargo Features

compiletest-rs has no features set by default.

[dependencies]
compiletest_rs = { version = "0.10.2", features = ["tmp", "rustc", "stable"] }
tmp = tempfile
rustc
stable

Does nothing. Should be removed at next major release

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features.

tempfile tmp?