Commit df1f401cf0

@@ -9,10 +9,25 @@ const testing = std.testing;
 const native_os = builtin.os;
 const have_ifnamesize = @hasDecl(os.system, "IFNAMESIZE");
 
+pub const ResolveScopeIdError = error{
+    NameTooLong,
+    PermissionDenied,
+    AddressFamilyNotSupported,
+    ProtocolFamilyNotAvailable,
+    ProcessFdQuotaExceeded,
+    SystemFdQuotaExceeded,
+    SystemResources,
+    ProtocolNotSupported,
+    SocketTypeNotSupported,
+    InterfaceNotFound,
+    FileSystem,
+    Unexpected,
+};
+
 /// Resolves a network interface name into a scope/zone ID. It returns
 /// an error if either resolution fails, or if the interface name is
 /// too long.
-pub fn resolveScopeId(name: []const u8) !u32 {
+pub fn resolveScopeId(name: []const u8) ResolveScopeIdError!u32 {
     if (have_ifnamesize) {
         if (name.len >= os.IFNAMESIZE) return error.NameTooLong;
 
@@ -433,7 +448,7 @@ pub const IPv6 = extern struct {
                 '0'...'9' => fmt.parseInt(u32, scope_id_slice, 10),
                 else => resolveScopeId(scope_id_slice) catch |err| switch (err) {
                     error.InterfaceNotFound => return error.InterfaceNotFound,
-                    else => |e| return e,
+                    else => err,
                 },
             } catch return error.UnknownScopeId;