Boolean(await f()) fails

[adrianp]

The following code:

var foo = async function() {
    var bar = Boolean(await baz());
};

fails with the following error:

AssertionError: test.js: false == true
    at explodeViaTempVar ([...]/node_modules/babel-preset-es2015/node_modules/babel-plugin-transform-regenerator/lib/emit.js:926:12)
    at [...]/node_modules/babel-preset-es2015/node_modules/babel-plugin-transform-regenerator/lib/emit.js:1042:20
    at Array.forEach (native)
    at Emitter.Ep.explodeExpression ([...]/node_modules/babel-preset-es2015/node_modules/babel-plugin-transform-regenerator/lib/emit.js:1041:14)
    at Emitter.Ep.explodeExpression ([...]/node_modules/babel-preset-es2015/node_modules/babel-plugin-transform-regenerator/lib/emit.js:1156:12)
    at Emitter.Ep.explodeStatement ([...]/node_modules/babel-preset-es2015/node_modules/babel-plugin-transform-regenerator/lib/emit.js:403:10)
    at [...]/node_modules/babel-preset-es2015/node_modules/babel-plugin-transform-regenerator/lib/emit.js:386:12
    at Array.forEach (native)
    at Emitter.Ep.explodeStatement ([...]/node_modules/babel-preset-es2015/node_modules/babel-plugin-transform-regenerator/lib/emit.js:385:22)
    at Emitter.Ep.explode ([...]/node_modules/babel-preset-es2015/node_modules/babel-plugin-transform-regenerator/lib/emit.js:333:17)

One way to fix it is:

var foo = async function() {
    var bar = await baz();
    baz = Boolean(baz);
};

$ babel --version
6.0.15 (babel-core 6.0.16)

[loganfsmyth]

You you make sure your node_modules/babel-preset-es2015/node_modules/babel-plugin-transform-regenerator is fully up-to-date?

[adrianp]

@loganfsmyth It's 6.0.14, the latest according the the project homepage.

[loganfsmyth]

Weird. This is the same assertion that was posted about here. #2723

Would you be up for trying to make a repo to reproduce this? I'm having trouble doing it locally.

[adrianp]

@loganfsmyth sure: https://github.com/adrianp/babel2743

Let me know if I can provide more details.

[loganfsmyth]

That assertion has been removed, and I can't reproduce locally. Care to give it another shot?

[adrianp]

Yep, seems to work now in 6.0.15 (babel-core 6.0.20), thanks!