Adding a character macro on digits breaks #x

[stassats]

(let ((*readtable* (copy-readtable)))
  (set-macro-character #\1 (lambda (s char) 1) t) ;; just imagine a more complete reader
  (read-from-string "#x1"))

Eclector says "The character 1 is not a digit in base 16." because its eclector.readtable:syntax-type is not :constituent.

I can't say what the standard wants, but all other lisp are okay with that.

[stassats]

There's only one sentence to apply for this
The consequences are undefined if the token immediately following the #nR does not have the syntax of a rational in radix n.

But then #x+10
=>
The character + is not a digit in base 16.

Or #10r10.
=> The character . is not a digit in base 10.

[scymtym]

The reader macro problem from the first comment has been fixed in s-expressionists/Eclector@23fd40a.

The first half of the second comment, #x+10, has been addressed in s-expressionists/Eclector@6e20928.

The potential problem with #10r10. remains for now as the right behavior is less clear.