Array intialization with one element problem

[lack-of-gravity-jack]

I'm running on compiler explorer https://godbolt.org/ following this tutorial: https://www.youtube.com/watch?v=MMxbP8ME2Ag
package helloworld api;
fn Main() -> i32 {
var arr: [i32;1] = (3);
return 0;
}

I'm getting this error
COMPILATION ERROR: <source>:7: type error in initializer of variable: 'i32' is not implicitly convertible to '[i32; 1]' Compiler returned: 1
If I add another element to the array and change the 1 to a 2, it works

var arr: [i32;2] = (3,3); //works
var arr: auto = (3); //also works

is this a problem with the compiler explorer?

[geoffromer]

The compiler explorer is correct. You can fix your example by writing (3,) instead of (3). See here for why that comma is necessary.