Haxe coalesce macro

output.txt

$ haxe --run Test
Test.hx:9: 53
Test.hx:11: 43

Test.hx

import haxe.macro.Expr;

class Test {
    static function main() {
        var x = 2;
        var y = 53;
        var z = 43;
        x = null;
        trace(coalesce(x, y, z));
        y = null;
        trace(coalesce(x, y, z));
    }

    macro static function coalesce<T>(e:Array<ExprOf<T>>):Expr {
        return macro {
            var v = null;
            $b{[for (expr in e) macro { if (v == null) { v = ${expr} } }]}
            v;
        };
    }
}

Test.js

// Generated by Haxe 3.4.0
(function () { "use strict";
var Test = function() { };
Test.main = function() {
        var x = 2;
        var y = 53;
        x = null;
        var v = null;
        if(v == null) {
                v = x;
        }
        if(v == null) {
                v = 53;
        }
        if(v == null) {
                v = 43;
        }
        console.log(v);
        y = null;
        var v1 = null;
        if(v1 == null) {
                v1 = x;
        }
        if(v1 == null) {
                v1 = y;
        }
        if(v1 == null) {
                v1 = 43;
        }
        console.log(v1);
};
Test.main();
})();