"<" in pug doesn't work

[puxxustc]

env

macOS 10.12.1 Beta
nodejs 6.8.1
vuejs 2.0.3

Steps to reproduce

init a test vue project with default options

vue init webpack test
cd test

edit src/components/Hello.vue

<template lang="pug">
div
  div(v-if!="0 < 0")
</template>

<script>
export default {
}
</script>

then run dev server

npm run dev

What is actually happening?

got error:

> [email protected] dev /Users/xiaoxiao/test
> node build/dev-server.js

Listening at http://localhost:8080

webpack: wait until bundle finished: /index.html
webpack built 65f1e5f2bb987f85bda4 in 2618ms
Hash: 65f1e5f2bb987f85bda4
Version: webpack 1.13.2
Time: 2618ms
 Asset    Size  Chunks       Chunk Names
app.js  867 kB       0       app

ERROR in ./src/components/Hello.vue
Module build failed: Error: Error parsing template:

< 0")
</template>

<script>
export default {
}
</script>

    at parseHTML (/Users/xiaoxiao/test/node_modules/vue-template-compiler/build.js:3434:13)
    at Object.parseComponent (/Users/xiaoxiao/test/node_modules/vue-template-compiler/build.js:5171:3)
    at module.exports (/Users/xiaoxiao/test/node_modules/vue-loader/lib/parser.js:15:21)
    at Object.module.exports (/Users/xiaoxiao/test/node_modules/vue-loader/lib/loader.js:145:15)
 @ ./~/babel-loader!./~/vue-loader/lib/selector.js?type=script&index=0!./src/App.vue 7:13-42
Child html-webpack-plugin for "index.html":
         Asset     Size  Chunks       Chunk Names
    index.html  1.46 MB       0
webpack: bundle is now VALID.

description

Similar issue: #3731 . However, situations are not the same. Replace "<" with ">" won't trigger this error. It's not a bug of pug as the error occurs before pug was called. In fact, this error happens even if pug is not installed.

Thanks for your time to review this issue.

[posva]

This is a problem with pug itself. Please refer to the other issues for some hints: https://github.com/vuejs/vue/issues?utf8=%E2%9C%93&q=is%3Aissue%20is%3Aclosed%20pug%20
or open an issue on the pug repository

[puxxustc]

@posva As I mentioned:

It's not a bug of pug as the error occurs before pug was called. In fact, this error happens even if pug is not installed.

[LinusBorg]

which version of vue-loader is installed?

[puxxustc]

@LinusBorg [email protected]

[puxxustc]

This may be an issue related to https://github.com/vuejs/vue/blob/dev/src/compiler/parser/html-parser.js#L47 . Pug is not a xml-like templting engine, so it can contain anything like script tag and style tag. Without specific treat, "<" may break html-parser's parsing procedure.

[LinusBorg]

I think this should have been fixed in 2.0.3:

Seems like it wasn't