Transpilation bug: Warnings on multi-variable let declarations

[rivo]

The following code:

{
  let x = 10,
      y = 20;
  console.log(y);
}

{
  let x = 30,
      y = 40;
  console.log(y);
}

gives the following warning:

JSC_CONSTANT_REASSIGNED_VALUE_ERROR: constant y assigned a value more than once.
Original definition at Input_0:4 at line 10 character 6
      y = 40;
      ^

(See for yourself on the Closure Compiler web app.)

This is the ES5 output which also appears to be incorrect (y from the first block should not be reused):

var x=10,y=20;console.log(y);var x$0=30;y=40;console.log(y);

The problem appears to be with declaring multiple variables with one let statement. If I give each variable its own let statement, it transpiles correctly without warnings:

{
  let x = 10;
  let y = 20;
  console.log(y);
}

{
  let x = 30;
  let y = 40;
  console.log(y);
}

Output:

var x=10,y=20;console.log(y);var x$0=30,y$1=40;console.log(y$1);

(There was some discussion about this already in this StackOverflow thread.)

[lauraharker]

Thanks for the report!

I've submitted a fix internally, and it will be out in the next push to GitHub.