Regression in curs-0.1.3, Rust 1.17

[brson]

boom! testing curs-0.1.3 against nightly for nightly
boom! running: cargo +nightly build --frozen
boom! creating container for: cargo +nightly build --frozen
boom! running `docker create -v /home/ec2-user/cargobomb/./work/local/test-source/nightly/nightly:/source:ro -v /home/ec2-user/cargobomb/./work/local/cargo-home:/cargo-home:ro -v /home/ec2-user/cargobomb/./work/local/rustup-home:/rustup-home:ro -v /home/ec2-user/cargobomb/./work/local/target-dirs/nightly/nightly:/target:rw -e USER_ID=500 -e CMD=cargo +nightly build --frozen cargobomb`
blam! af7aa3bfb0cd952fd945ba979d3d1249ef29a145140a3d36af9485410134d205
boom! running `docker start -a af7aa3bfb0cd952fd945ba979d3d1249ef29a145140a3d36af9485410134d205`
kablam! error: unable to get packages from source
kablam! 
kablam! Caused by:
kablam!   failed to parse manifest at `/cargo-home/registry/src/github.com-1ecc6299db9ec823/url-0.5.5/Cargo.toml`
kablam! 
kablam! Caused by:
kablam!   could not parse input as TOML
kablam! 
kablam! Caused by:
kablam!   expected newline, found an identifier at line 14
boom! running `docker rm -f af7aa3bfb0cd952fd945ba979d3d1249ef29a145140a3d36af9485410134d205`
blam! af7aa3bfb0cd952fd945ba979d3d1249ef29a145140a3d36af9485410134d205

cc @alexcrichton

[brson]

cc @bitex-la

[alexcrichton]

This was caused in the TOML refactor in Cargo, the fallback support to support malformed Cargo.toml is likely broken.

[alexcrichton]

Fixes are sent to Cargo, I'll send PRs to rust-lang/rust when they're merged