No fluid or dynamic variables in any standard before R7RS, and it is trivial to roll your own parameters provided they don't have to interact with threads: see R7RS.

On Sun, Mar 8, 2020 at 12:48 PM Lassi Kortela <lassi@lassi.io> wrote:
> For fluid variables, see the withdrawn SRFI 15.

Were fluid variables ever a part of any Scheme standard?

Were any dynamic-variable-style facilities before R7RS?

How does R6RS deal with dynamic variables - is the user expected to roll
their own using dynamic-wind? I though parameterize was in that standard
as well, but I looked again and it's not. Just some R6RS implementations
have it.

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