This project is not under development and does nothing useful. If you just want to compile Rust to WASM then the mainline Rust compiler can do that for you. Read https://rustwasm.github.io/book/
An experimental compiler from Rust to WebAssembly, based on rustc + Rust MIR.
This doesn't do anything useful yet.
I recommend that you install rustup and then use it to install the current rustc nightly version:
Tested with nightly-2017-03-03
git clone https://github.com/brson/mir2wasm.git
cd mir2wasm
rustup override set nightly-2017-03-03
cargo build
cargo run -q -- rust-examples/nocore-hello-world.rs
Do println debugging with debug!
so it goes to stderr and print it like:
RUST_LOG=mir2wasm cargo run -q -- rust-examples/nocore-hello-world.rs
rustc -Z unstable-options --unpretty=mir rust-examples/nocore-hello-world.rs
Plug this stuff into a wast file to print something:
(import $print_i32 "spectest" "print" (param i32))
(export "foo" $foo)
...
(call_import $print_i32 (get_local $1))
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