handle tls alert switch correctly and link correct error set compare issue

Author: truemedian

lib/std/crypto/tls.zig

@@ -225,7 +225,7 @@ pub const AlertDescription = enum(u8) {
             .unknown_psk_identity => error.TlsAlertUnknownPskIdentity,
             .certificate_required => error.TlsAlertCertificateRequired,
             .no_application_protocol => error.TlsAlertNoApplicationProtocol,
-            else => error.TlsAlertUnknown,
+            _ => error.TlsAlertUnknown,
         };
     }
 };

lib/std/http/Client.zig

@@ -169,7 +169,7 @@ pub const Connection = struct {
             .plain => conn.stream.readAtLeast(buffer, len),
             .tls => conn.tls_client.readAtLeast(conn.stream, buffer, len),
         } catch |err| {
-            // is there a better way to check if an error is a member of a certain set
+            // TODO: https://github.com/ziglang/zig/issues/2473
             if (mem.startsWith(u8, @errorName(err), "TlsAlert")) return error.TlsAlert;
 
             switch (err) {