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tests length of zero allocation #25561

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tests length of zero allocation #25561

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2 changes: 2 additions & 0 deletions lib/std/heap.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -598,6 +598,8 @@ pub fn testAllocator(base_allocator: mem.Allocator) !void {

// Zero-length allocation
const empty = try allocator.alloc(u8, 0);
try testing.expect(empty.len == 0);
try testing.expect(empty.ptr == @as([*]u8, @ptrFromInt(std.math.maxInt(usize))));
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The check for length is needed in this test, however not sure this check of the ptr is needed. Created this check based on experiments and looking at how the current code works.

allocator.free(empty);
// Allocation with zero-sized types
const zero_bit_ptr = try allocator.create(u0);
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