Make error sets explicit

lib/minifb/src/minifb.zig

@@ -227,14 +227,15 @@ pub fn Window(comptime TUserData: type) type {
             reserved: u27 = 0,
         };
 
-        pub fn open(title: [*:0]const u8, width: u32, height: u32, flags: OpenFlags) !Window(TUserData) {
+        const OpenError = error{OpenFailed};
+        pub fn open(title: [*:0]const u8, width: u32, height: u32, flags: OpenFlags) OpenError!Window(TUserData) {
             const cwin: ?*c.mfb_window = c.mfb_open_ex(title, width, height, @bitCast(u32, flags));
             if (cwin) |value| {
                 const win = Window(TUserData){ .cwin = value };
                 assert(@bitCast(usize, win) == @ptrToInt(win.cwin));
                 return win;
             } else {
-                return error.ItBroke;
+                return OpenError.OpenFailed;
             }
         }
 
@@ -367,12 +368,12 @@ test "set and get target FPS" {
 pub const Timer = extern struct {
     ctimer: *c.mfb_timer,
 
-    pub fn init() !Timer {
+    pub fn init() std.mem.Allocator.Error!Timer {
         const ctimer: ?*c.mfb_timer = c.mfb_timer_create();
         if (ctimer) |value| {
             return Timer{ .ctimer = value };
         } else {
-            return error.ItBroke;
+            return std.mem.Allocator.Error.OutOfMemory;
         }
     }