var id = (x) => x, x = id(...[1,2,3]); typeof x;

[drsm]

>> var id = (x) => x, x = id(...[1,2,3]); typeof x;
'object'

it doesn't fail like it should.

[277hz]

Could you explain for me how or why it should fail?
One difference I see when executing with e.g. Chrome:

var id = (x) => x, x = id(...[1,2,3]); console.log(typeof x, x);
number 1

Firefox:

var id = (x) => x, x = id(...[1,2,3]); console.log(typeof x, x);
number 1

njs:

interactive njs 0.5.3

>> var id = (x) => x, x = id(...[1,2,3]); console.log(typeof x, x);
object [1,2,3]

interactive njs 0.6.0

>> var id = (x) => x, x = id(...[1,2,3]); console.log(typeof x, x);
object [1,2,3]

Edit:
Maybe because spread is not supported at all?

interactive njs 0.6.0

>> [...[1,2,3]]
[

]

[drsm]

@277hz
Hi!
It should fail 'cause it's not supported #78 :)

[277hz]

@drsm See #78.

>> ((a, b, c, d) => console.log(a, b, c, d))(...[1, 3], ...[2, 4]);
1 3 2 4

>> ((a, b, c, d) => console.log(a, b, c, d))(...[1, 3], [2, 4]);
1 3 [2,4] undefined

>> ((a, b, c, d) => console.log(a, b, c, d))(...[1, 3], [2], 4]);
1 3 [2] 4