compiler crash with unreachable in BlockStatement

[HerrCai0907]

code:

export function test(a: i32): i32 {
  let t = [];
  if (t.length == 0) {
    return 2;
  }
  {
    return unreachable();
  }
}

Error Message:

[wasm-validator error in function assembly/index/test] unexpected false: local.get must have a valid type - check what you provided when you constructed the node, on 
(local.get $4)
[wasm-validator error in function assembly/index/test] unexpected false: vars must be defaultable, on 
unreachable
FAILURE validate error
    at Object.main (/home/ccc/Desktop/test/as/node_modules/assemblyscript/cli/asc.js:953:23)
    at /home/ccc/Desktop/test/as/node_modules/assemblyscript/bin/asc:19:47

[technohippy]

For someone's information, both codes below are success to compile:

export function test(a: i32): i32 {
  let t = [];
  if (isArray(t)) { /**/
    return 2;
  }
  {
    return unreachable();
  }
}

export function test(a: i32): i32 {
  let t = [];
  if (t.length == 0) {
    return 2;
  }
  {
    unreachable(); /**/
    return 0; /**/
  }
}