Clarification regarding reserved datatypes in OpenCL

The OpenCL spec describes reserved datatypes here:
[https://registry.khronos.org/OpenCL/specs/3.0-unified/html/OpenCL_C.html#reserved-data-types](url)

It is mentioned in the spec that the data type names described in the table are reserved and **cannot be used by applications as type names**.

I was trying to understand what is meant by "cannot be used by applications as type names"

Does this necessitate that these datatypes cannot be used in a kernel and compilation of such kernels leads to an error?

Start with the reserved data types section of the OpenCL C specification linked in the issue, and compare its wording with the surrounding type-name rules. Determine whether the statement describes kernel compilation behavior or application naming restrictions. Done means the specification's interpretation is clearly documented or clarified in the issue.

Written by the indexing model from the issue text.