compile: x86_64-unknown-linux-gnu/rt/stage1/arch/x86_64/_context.o compile: x86_64-unknown-linux-gnu/rt/stage1/arch/x86_64/record_sp.o compile: x86_64-unknown-linux-gnu/rt/stage1/rust_try.o link: x86_64-unknown-linux-gnu/rt/stage1/librustrt.a cp: x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustrt.a compile: x86_64-unknown-linux-gnu/rt/stage1/arch/x86_64/morestack.o link: x86_64-unknown-linux-gnu/rt/stage1/arch/x86_64/libmorestack.a cp: x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libmorestack.a compile_and_link: x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd.so error: unknown debug flag: no-debug-borrows error: internal compiler error: unexpected failure This message reflects a bug in the Rust compiler. We would appreciate a bug report: http://static.rust-lang.org/doc/master/complement-bugreport.html note: the compiler hit an unexpected failure path. this is a bug task 'rustc' failed at 'explicit failure', /home/mark/Documents/repos/rust/src/librustc/driver/driver.rs:1137 /home/mark/Documents/repos/rust/mk/target.mk:189: recipe for target 'x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd.so' failed make: *** [x86_64-unknown-linux-gnu/stage1/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd.so] Error 101