Commit 40578656e85a4bd930b03c143f179d43a925d151 | zig

Closes #12890

3 files changed, 25 insertions(+), 1 deletions(-)

src/Zir.zig+6-1

 @@ -3051,11 +3051,16 @@ pub const Inst = struct {
             var multi_i: u32 = 0;
             while (true) : (multi_i += 1) {
                 const items_len = zir.extra[extra_index];
-                extra_index += 2;
+                extra_index += 1;
+                const ranges_len = zir.extra[extra_index];
+                extra_index += 1;
                 const body_len = @truncate(u31, zir.extra[extra_index]);
                 extra_index += 1;
                 const items = zir.refSlice(extra_index, items_len);
                 extra_index += items_len;
+                // Each range has a start and an end.
+                extra_index += 2 * ranges_len;
                 const body = zir.extra[extra_index..][0..body_len];
                 extra_index += body_len;

test/behavior.zig+1

test/behavior/bugs/12890.zig created+18

...	@@ -0,0 +1,18 @@
1	const expect = @import("std").testing.expect;
2	const builtin = @import("builtin");
3
4	fn a(b: []u3, c: u3) void {
5	switch (c) {
6	0...1 => b[c] = c,
7	2...3 => b[c] = c,
8	4...7 => \|d\| b[d] = c,
9	}
10	}
11	test {
12	if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
13	if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
14
15	var arr: [8]u3 = undefined;
16	a(&arr, 5);
17	try expect(arr[5] == 5);
18	}