One thing that very clearly distinguished (extended dialects of) Pascal from C in the era where the two were competing was that Pascal's units were self-describing. That is, when you compiled a unit, you got a single file with all the metadata for that unit as well as binary object code for linking. Then, when another unit or program did a USES declaration, that would locate the file by name and use the metadata as needed. Conversely, in C you had to deal with header files, and while on the surface it looks kinda sorta like the INTERFACE section of the Pascal unit, it's not quite that because e.g. it needs to #include things it depends on - and that is textual inclusion, not just a metadata reference.
This all meant that working with dynamically loaded type information was much easier in Pascal tooling - it just needed to parse the metadata embedded in the compiled unit files, and each file would only contain metadata for its own types and functions, without contamination from other units that it relies on. This is great for things like code completion and visual UI designers.