Hi,

expr looks pretty useful

It mentions srfi-105 (curly-infix) only as "not how we do it", though.

But srfi-105 provides a way to extend it, and expr might fit right into
that:

> However, an implementation MAY provide one or more libraries that when
> imported bind the “$nfx$” and/or “$bracket-apply$” symbols
https://srfi.schemers.org/srfi-105/srfi-105.html

and

> Forms with mixed infix operators and other complications have “$nfx$”
> prepended to enable later processing, e.g., {4 + 5 * 6} ⇒ ($nfx$ 4 + 5
> * 6)

So by implementing expr in terms of a macro named $nfx$, there would be
good operability between expr and curly-infix and expr would provide
richer semantics to curly-infix.

Best wishes,
Arne
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