Variable name contains '#'

variable.reservedHash

Message

Variable '<name>' contains '#', which is reserved in many MeTTa parsers.

What it means

A variable name includes #, which some MeTTa parsers reserve, so the program may not port cleanly.

Why it happens

A # was included in a $-variable name.

How to fix it

Rename the variable without #.

(= (f $x#1) $x#1)   ; variable.reservedHash

Controlled by the metta.diagnostics.undefinedVariables setting.