Merge pull request #24433 from Justus2308/switch-label-halt

Sema: Fix invalid AIR generation for switch loop with comptime discarded tag

src/Sema.zig

@@ -13041,8 +13041,10 @@ fn analyzeSwitchRuntimeBlock(
     sema.air_extra.appendSliceAssumeCapacity(@ptrCast(cases_extra.items));
     sema.air_extra.appendSliceAssumeCapacity(@ptrCast(else_body));
 
+    const has_any_continues = spa.operand == .loop and child_block.label.?.merges.extra_insts.items.len > 0;
+
     return try child_block.addInst(.{
-        .tag = if (spa.operand == .loop) .loop_switch_br else .switch_br,
+        .tag = if (has_any_continues) .loop_switch_br else .switch_br,
         .data = .{ .pl_op = .{
             .operand = operand,
             .payload = payload_index,

test/behavior/switch_loop.zig

@@ -216,3 +216,13 @@ test "switch loop with pointer capture" {
     try S.doTheTest();
     try comptime S.doTheTest();
 }
+
+test "unanalyzed continue with operand" {
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+
+    @setRuntimeSafety(false);
+    label: switch (false) {
+        false => if (false) continue :label true,
+        true => {},
+    }
+}