Description
Compiling a simple Hello, World program:
$ rustc -V
rustc 1.20.0 (f3d6973f4 2017-08-27)
# Note the trailing "zzzz"
$ RUSTFLAGS=-Ctarget-feature=+crt-staticzzzz cargo build -v
Compiling rust-test v0.1.0 (rust-test)
Running `rustc --crate-name rust_test src/main.rs --crate-type bin --emit=dep-info,link -C debuginfo=2 -C metadata=aafe1708c049ad76 -C extra-filename=-aafe1708c049ad76 --out-dir rust-test/target/debug/deps -L dependency=rust-test/target/debug/deps '-Ctarget-feature=+crt-staticzzzz'`
Finished dev [unoptimized + debuginfo] target(s) in 0.25 secs
Should RUSTFLAGS=-Ctarget-feature=+crt-staticzzzz be silently accepted?
If I pass RUSTFLAGS=-Ctarget-feature=+batman, a warning is printed, as expected.
'+batman' is not a recognized feature for this target (ignoring feature)
Why is trailing misspelling silently allowed?