What Should We _Remove_ from Zig?

[glfmn]

It is possible to assert that a certain error isn’t possible to return from a function which I think can help with Reader/Writer interface stuff:

Making it harder to swallow `error.Canceled`

One thing that I realized people might not be aware of is that you can defensively program against errors being allowed at callsites: test { foo() catch |err| switch (err) { error.WriteFailed => comptime unreachable, error.ReadFailed => comptime unreachable, error.Canceled => comptime unreachable, else => |e| return e, }; } fn foo() !void { // ... } This compiles. However if you return error.Canceled for example from foo, then you get a compile erro…