cargo web test fails on master #659
Description
This Travis job has started failing on master:
@alexcrichton can you solve or reassign?
$ cargo web test --nodejs --target wasm32-unknown-unknown --features=stdweb
warning: debug builds on the wasm32-unknown-unknown are currently totally broken
forcing a release build
Compiling proc-macro2 v0.4.24
Compiling semver-parser v0.7.0
Compiling unicode-xid v0.1.0
Compiling ryu v0.2.7
Compiling serde v1.0.80
Compiling num-traits v0.2.6
Compiling itoa v0.4.3
Compiling num-integer v0.1.39
Compiling stdweb-internal-runtime v0.1.2
Compiling custom_derive v0.1.7
Compiling base-x v0.2.3
Compiling rand_core v0.3.0 (/home/travis/build/rust-random/rand/rand_core)
Compiling float-ord v0.2.0
Compiling discard v1.0.4
Compiling semver v0.9.0
Compiling conv v0.3.3
Compiling rand_xorshift v0.1.0 (/home/travis/build/rust-random/rand/rand_xorshift)
Compiling rand_isaac v0.1.1 (/home/travis/build/rust-random/rand/rand_isaac)
Compiling rand_hc v0.1.0 (/home/travis/build/rust-random/rand/rand_hc)
Compiling rustc_version v0.2.3
Compiling quote v0.6.10
Compiling serde_json v1.0.33
Compiling stdweb-internal-macros v0.2.2
Compiling rand_chacha v0.1.0 (/home/travis/build/rust-random/rand/rand_chacha)
Compiling stdweb v0.4.10
Compiling rand_pcg v0.1.1 (/home/travis/build/rust-random/rand/rand_pcg)
Compiling rand v0.6.1 (/home/travis/build/rust-random/rand)
Compiling syn v0.15.22
Compiling average v0.9.2
Compiling serde_derive v1.0.80
Compiling stdweb-derive v0.5.1
Finished release [optimized] target(s) in 3m 01s
Garbage collecting "rand-7b95d3a8976c69c3.wasm"...
Processing "rand-7b95d3a8976c69c3.wasm"...
warning: unsupported custom section: 'producers', please report this!
Finished processing of "rand-7b95d3a8976c69c3.wasm"!
warning: debug builds on the wasm32-unknown-unknown are currently totally broken
forcing a release build
Compiling rand v0.6.1 (/home/travis/build/rust-random/rand)
Finished release [optimized] target(s) in 4.35s
Garbage collecting "uniformity-fe00c78ef661f1fc.wasm"...
Processing "uniformity-fe00c78ef661f1fc.wasm"...
warning: unsupported custom section: 'producers', please report this!
Finished processing of "uniformity-fe00c78ef661f1fc.wasm"!
/home/travis/.cache/cargo-web/bin/test_runner.js:305
const ctor = WebAssembly.Instance;
^
ReferenceError: WebAssembly is not defined
at /home/travis/.cache/cargo-web/bin/test_runner.js:305:37
at Object.<anonymous> (/home/travis/.cache/cargo-web/bin/test_runner.js:327:3)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.runMain (module.js:604:10)
at run (bootstrap_node.js:383:7)
at startup (bootstrap_node.js:149:9)
/home/travis/.cache/cargo-web/bin/test_runner.js:305
const