Function call disappear if there is a comment above it

[NeeEoo]

• Operating System: Windows 10
• Node Version: v10.9.0
• NPM Version: 6.4.1
• webpack Version: 4.29.6
• terser-webpack-plugin Version: 1.2.3

Expected Behavior

The registerCmd function call should not disappear when there is a comment above it

Actual Behavior

The registerCmd function call disappears from the output

Code

/*registerCmd("cal", function(argv) { // Old code
   // ... 142 lines of private code
}, "cal - Shows a calendar")*/

registerCmd("cal", function(argv) { // New code
   // ... 154 lines of private code
}, "cal - Shows a calendar")

const TerserPlugin = require('terser-webpack-plugin');
// ...
new TerserPlugin({
    terserOptions: {
        mangle: true,
        output: {
            comments: /@license/i
        },
        ecma: 8,
        compress: {
            unsafe: true,
            sequences: true,
            passes: 5
        },
        parallel: true
    },
    parallel: true
})

How Do We Reproduce?

Cannot provide a repo because my project is closed source

[NeeEoo]

I found why the function call disappears it is because the old code comment had #__PURE__ so the function call became pure

[alexander-akait]

We just wrapper around terser (https://github.com/terser-js/terser), if you think it is bug please open issue in their repo, we can't do something on our side (we don't modify your code, just send this code to terser and return output), thanks!