Merge pull request #4561 from LemonBoy/fix-4536-1

Resend of #4552

1 files changed, 54 insertions, 2 deletions

diff --git a/test/stage1/behavior/sizeof_and_typeof.zig b/test/stage1/behavior/sizeof_and_typeof.zig
index a738dbbbf9..322c5fbbad 100644
--- a/test/stage1/behavior/sizeof_and_typeof.zig
+++ b/test/stage1/behavior/sizeof_and_typeof.zig
@@ -1,5 +1,7 @@
-const builtin = @import("builtin");
-const expect = @import("std").testing.expect;
+const std = @import("std");
+const builtin = std.builtin;
+const expect = std.testing.expect;
+const expectEqual = std.testing.expectEqual;
 
 test "@sizeOf and @TypeOf" {
     const y: @TypeOf(x) = 120;
@@ -135,3 +137,53 @@ test "@bitSizeOf" {
         a: u2
     }) == 2);
 }
+
+test "@sizeOf comparison against zero" {
+    const S0 = struct {
+        f: *@This(),
+    };
+    const U0 = union {
+        f: *@This(),
+    };
+    const S1 = struct {
+        fn H(comptime T: type) type {
+            return struct {
+                x: T,
+            };
+        }
+        f0: H(*@This()),
+        f1: H(**@This()),
+        f2: H(***@This()),
+    };
+    const U1 = union {
+        fn H(comptime T: type) type {
+            return struct {
+                x: T,
+            };
+        }
+        f0: H(*@This()),
+        f1: H(**@This()),
+        f2: H(***@This()),
+    };
+    const S = struct {
+        fn doTheTest(comptime T: type, comptime result: bool) void {
+            expectEqual(result, @sizeOf(T) > 0);
+        }
+    };
+    // Zero-sized type
+    S.doTheTest(u0, false);
+    S.doTheTest(*u0, false);
+    // Non byte-sized type
+    S.doTheTest(u1, true);
+    S.doTheTest(*u1, true);
+    // Regular type
+    S.doTheTest(u8, true);
+    S.doTheTest(*u8, true);
+    S.doTheTest(f32, true);
+    S.doTheTest(*f32, true);
+    // Container with ptr pointing to themselves
+    S.doTheTest(S0, true);
+    S.doTheTest(U0, true);
+    S.doTheTest(S1, true);
+    S.doTheTest(U1, true);
+}