in lib/generator.js [183:192]
visitFor(ast, level) {
assert.equal(ast.type, 'for');
this.emit(`for (`, level);
this.visitType(ast.list.inferred.itemType);
this.emit(` ${_name(ast.id)} : `);
this.visitExpr(ast.list, level + 1);
this.emit(') {\n');
this.visitStmts(ast.stmts, level + 1);
this.emit('}\n', level);
}