Error when building rustc on up-to-date Arch Linux (x86-64)

[smikims]

Here's the last few lines of output:

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

[huonw]

Thanks for the report! The error of interest here is unknown debug flag: no-debug-borrows, and is caused by removing the no-debug-borrows flag a few days ago.

Rerunning configure will fix it. (see also, #11707)