Problems building js.rs

[cxbrooks]

I realize this code is fairly old, but it does not seem to compile.

Under rustc 1.12.1 (d4f39402a 2016-10-19), make yields:

   Compiling jit v0.9.1 (https://github.com/TomBebbington/jit.rs.git#9c0e4fa5)
error[E0554]: #[feature] may not be used on the stable release channel
  --> /Users/cxh/.cargo/git/checkouts/jit.rs-1551653203d982b5/master/src/jit.rs:29:1
   |
29 | #![feature(alloc, core, plugin, unboxed_closures, optin_builtin_traits, associated_consts)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Searching for that error message suggests using rustup. Installing rustup and using the nightly version also fails:

bash-3.2$ rustup install nightly
info: syncing channel updates for 'nightly-x86_64-apple-darwin'

  nightly-x86_64-apple-darwin unchanged - rustc 1.14.0-nightly (3f4408347 2016-10-27)

bash-3.2$ rustup default nightly
info: using existing install for 'nightly-x86_64-apple-darwin'
info: default toolchain set to 'nightly-x86_64-apple-darwin'

  nightly-x86_64-apple-darwin unchanged - rustc 1.14.0-nightly (3f4408347 2016-10-27)

bash-3.2$ rustc --version
rustc 1.14.0-nightly (3f4408347 2016-10-27)
bash-3.2$ make clean
rm -rf target/*js*
bash-3.2$ make
cargo build
   Compiling libjit-sys v0.2.1 (https://github.com/TomBebbington/jit.rs.git#9c0e4fa5)
   Compiling matches v0.1.3
   Compiling libc v0.2.17
   Compiling unicode-normalization v0.1.2
   Compiling unicode-bidi v0.2.3
   Compiling jit v0.9.1 (https://github.com/TomBebbington/jit.rs.git#9c0e4fa5)
error[E0432]: unresolved import `std::raw::Repr`
  --> /Users/cxh/.cargo/git/checkouts/jit.rs-1551653203d982b5/master/src/compile.rs:68:17
   |
68 |             use std::raw::Repr;
   |                 ^^^^^^^^^^^^^^ no `Repr` in `std::raw`

error[E0432]: unresolved import `std::raw::Slice`
  --> /Users/cxh/.cargo/git/checkouts/jit.rs-1551653203d982b5/master/src/compile.rs:82:13
   |
82 |         use std::raw::Slice;
   |             ^^^^^^^^^^^^^^^ no `Slice` in `std::raw`

error: no method named `repr` found for type `&'a str` in the current scope
  --> /Users/cxh/.cargo/git/checkouts/jit.rs-1551653203d982b5/master/src/compile.rs:70:30
   |
70 |             let slice = self.repr();
   |                              ^^^^

   Compiling idna v0.1.0 (https://github.com/servo/rust-url#da5c7c6e)
error: aborting due to previous error

Build failed, waiting for other jobs to finish...
error: Could not compile `jit`.

To learn more, run the command again with --verbose.
make: *** [build] Error 101
bash-3.2$ 

Then I tried installing a version of rust from last commit time of Nov 15, 2014.

Unfortunately, rustup does not seem to have versions that old. The rustup docs state that 2014-12-18 should work, but it does not. See Rustup Bug 787: help.rs suggests 'rustup install nightly-2014-12-18', which fails.

However, rustup install nightly-2015-03-01 installs a nightly version, but that version does not work with the js.rs code:

bash-3.2$ rustup install nightly-2015-03-01
info: syncing channel updates for 'nightly-2015-03-01-x86_64-apple-darwin'
info: downloading component 'rust'

  nightly-2015-03-01-x86_64-apple-darwin unchanged - rustc 1.0.0-nightly (890293655 2015-0\
2-28) (built 2015-02-28)

bash-3.2$ rustup default nightly-2015-03-01
info: using existing install for 'nightly-2015-03-01-x86_64-apple-darwin'
info: default toolchain set to 'nightly-2015-03-01-x86_64-apple-darwin'

  nightly-2015-03-01-x86_64-apple-darwin unchanged - rustc 1.0.0-nightly (890293655 2015-0\
2-28) (built 2015-02-28)

bash-3.2$ rustc --version
rustc 1.0.0-nightly (890293655 2015-02-28) (built 2015-02-28)
bash-3.2$ make clean
rm -rf target/*js*
bash-3.2$ make
cargo build
Unable to update https://github.com/servo/rust-url#da5c7c6e

Caused by:
  failed to parse manifest at `/Users/cxh/.cargo/git/checkouts/rust-url-1e22af4233079a1e/m\
aster/Cargo.toml`

Caused by:
  expected a value of type `array`, but found a value of type `table` for the key `lib`
make: *** 

[jasonwilliams]

@cxbrooks i think this project is dead, ive started working on a rewrite over at https://github.com/jasonwilliams/boa it might take a while to get it back up to where this is but feel free to help out

[cxbrooks]

Cool that you have forked this, there is clearly a need for a JavaScript interpreter implemented in Rust. My main goal with reporting this issue was to let people know that Rust had evolved past being able to compile this code. My career has moved in other directions, so I'll probably not be much help with this effort. Keep up the good fight!