When jumping into a case following prior cases declaring local variables,
the preceding local variable declarations were skipped, leading to an
unexpected stack layout which caused local variables to carry wrong
values at run time and eventual segmentation faults when attempting to
unwind the stack on leaving the lexical switch scope.

-- Expect stdout --
Matching 1:
 - 1: [ null, null, 3, 4 ]
 - 2: [ null, null, 3, 4, 5, 6 ]
Matching 2:
 - 2: [ null, null, null, null, 5, 6 ]
Matching 3:
 - default: [ 1, 2 ]
 - 1: [ 1, 2, 3, 4 ]
 - 2: [ 1, 2, 3, 4, 5, 6 ]
-- End --

-- Testcase --
{%
	for (let n in [1, 2, 3]) {
		printf("Matching %d:\n", n);

		switch (n) {
			default:
				let x = 1, y = 2;
				print(" - default: ", [x, y], "\n");

			case 1:
				let a = 3, b = 4;
				print(" - 1: ", [x, y, a, b], "\n");

			case 2:
				let c = 5, d = 6;
				print(" - 2: ", [x, y, a, b, c, d], "\n");
		}
	}
%}
-- End --