cargo web test fails on master

[dhardy]

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 

[alexcrichton]

I don't personally know about stdweb or how to run/test it

[dhardy]

Sorry.

@koute can you help with this?

[koute]

Hmm... this looks like Node.js suddenly stopped supporting WebAssembly? O_O

I'll investigate ASAP.

[koute]

It looks like that build got assigned to a machine with an ancient Node.js for some reason.

One of the recent good jobs has this:

Pre-installed Node.js versions
v4.8.6
v6.12.0
v6.12.1
v8.9
v8.9.1
phpenv versions
  system
  5.6
* 5.6.32 (set by /home/travis/.phpenv/version)
  7.0
  7.0.25
  7.1
  7.1.11
  hhvm
  hhvm-stable

The bad job doesn't have the "Pre-installed Node.js versions" section at all, and various details (the kernel, the 'build image provisioning date and time', etc. are also different).

I don't know enough about Travis to be able to tell why exactly did this happen, but making sure we have new enough Node.js before running the tests should hopefully fix this.