When compiling a for-loop local variable initializer expression, the compiler
incorrectly treated subsequent declarations as global variable assignments,
triggering reference error exceptions in strict mode.

-- Expect stdout --
1
-- End --

-- Testcase --
{%
	"use strict";

	// The initializer expression below was incorrectly interpreted as
	// `let x = 0; y = 1` instead of the correct `let ..., y = 1`.
	for (let x = 0, y = 1; x < 1; x++)
		print(y, "\n");
%}
-- End --