make it a compile error to call allocator.destroy on a non-single-item pointer

[Jarred-Sumner]

Zig Version

0.11.0-dev.4006+bf827d0b5

Steps to Reproduce and Observed Output

Failing test:

test {
    var buffer = try @import("std").heap.page_allocator.alloc(u8, 0);
    @import("std").heap.page_allocator.destroy(buffer);
}

Test [1/1] test_0... thread 41234524 panic: incorrect alignment
/Users/jarred/zig/0.11.0-dev.4006+bf827d0b5/files/lib/std/heap/PageAllocator.zig:107:19: 0x102379ea3 in free (test)
        os.munmap(@alignCast(slice.ptr[0..buf_aligned_len]));
                  ^
/Users/jarred/zig/0.11.0-dev.4006+bf827d0b5/files/lib/std/mem/Allocator.zig:98:28: 0x102378acb in destroy__anon_1390 (test)
    return self.vtable.free(self.ptr, buf, log2_buf_align, ret_addr);
                           ^
/Users/jarred/Desktop/repro.zig:3:47: 0x102378773 in test_0 (test)
    @import("std").heap.page_allocator.destroy(buffer);
                                              ^
/Users/jarred/zig/0.11.0-dev.4006+bf827d0b5/files/lib/test_runner.zig:175:28: 0x10238098b in mainTerminal (test)
        } else test_fn.func();
                           ^
/Users/jarred/zig/0.11.0-dev.4006+bf827d0b5/files/lib/test_runner.zig:35:28: 0x10237919f in main (test)
        return mainTerminal();
                           ^
/Users/jarred/zig/0.11.0-dev.4006+bf827d0b5/files/lib/std/start.zig:598:22: 0x102378d2b in main (test)
            root.main();

Expected Output

allocator.destroy(slice) should be a compiler error since allocator.alloc says to use allocator.free

[andrewrk]

incorrect API usage:

test {
    var buffer = try @import("std").heap.page_allocator.alloc(u8, 0);
-    @import("std").heap.page_allocator.destroy(buffer);
+    @import("std").heap.page_allocator.free(buffer);
}

$ zig test test.zig 
All 1 tests passed.

zig/lib/std/mem/Allocator.zig

Lines 109 to 111 in dc24835

	/// `ptr` should be the return value of `create`, or otherwise
	/// have the same address and alignment property.
	pub fn destroy(self: Allocator, ptr: anytype) void {

[Jarred-Sumner]

Why isn't it a compiler error?