Memory leakage while compiling `imgui-ext` on nightly

[tombuchholz]

Trying cargo build inside of https://github.com/germangb/imgui-ext using

toolchain: nightly-x86_64-unknown-linux-gnu
version: rustc 1.4.2.0-nightly
distribution: arch linux
kernel: 5.4.15-arch1-1

does eat up memory (>28GB) until OS kills it.
On stable toolchain compiling works as expected.

Meta

rustc --version --verbose:
rustc 1.42.0-nightly (8a79d08 2020-01-27)
binary: rustc
commit-hash: 8a79d08
commit-date: 2020-01-27
host: x86_64-unknown-linux-gnu
release: 1.42.0-nightly
LLVM version: 9.0

[matthiaskrgr]

I get the same compiling backtrace-sys.

[matthiaskrgr]

perf top shows high cpu utilization by cargo::util::progress::State::tick and it is actually cargo that consumes all the memory.
This is probably rust-lang/cargo#7840

[jonas-schievink]

Oh yeah this is just the Cargo thing.