gistfile1.txt

> haxe -x Main
Lambdas.hx:11: [{ kind => FFun({ args => [], expr => { expr => EBlock([]), pos => #pos(Main.hx:2: lines 2-9) }, params => [], ret => null }), meta => [], name => main, doc => null, pos => #pos(Main.hx:2: lines 2-9), access => [AStatic] }]

Lambdas.hx

import haxe.macro.Expr;
import haxe.macro.ExprTools;
import haxe.macro.Context;

@:autoBuild(ShortLambdas.run()) interface Lambdas {}
class ShortLambdas {
    public static function run() {
        var fields = Context.getBuildFields();
        // perform AST transforms.
        // trace fields for now to check it's running
        trace(fields);
        return fields;
    }
}

Main.hx

class Main implements Lambdas {
    static function main() {
    }
}