Fix Issue 9848 - Better diagnostic when basic type was not expected

[ntrel]

No description provided.

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	9848	enhancement	Better diagnostic when type declaration was not expected

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#14672"

[ntrel]

Azure OMF failing:

+ curl -fsSL -A 'DMD-CI curl 7.85.0 (x86_64-w64-mingw32) libcurl/7.85.0 OpenSSL/1.1.1q (Schannel) zlib/1.2.12 brotli/1.0.9 zstd/1.5.2 libidn2/2.3.3 libssh2/1.10.0 nghttp2/1.48.0' --retry 5 --retry-max-time 120 --connect-timeout 5 --speed-time 30 --speed-limit 1024 https://downloads.dlang.org/other/dm857c.zip -o dmc.zip
curl: (22) The requested URL returned error: 522
##[error]Cmd.exe exited with code '22'.