error-const-set-2.ck:4:3: error: cannot chuck/assign '=>' to 'Math.PI'...
[4] 1 => Math.PI;
      ^
error-const-set-2.ck:4:6: error: ...(reason: 'Math.PI' is a constant, and is not assignable)
[4] 1 => Math.PI;
         ^
