basic-lang 0.7.1

The BASIC programming language as it was in the 8-bit era.
Documentation 
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/*!
# `DEF FN<name>(<argument>[,<argument>...]) = <expression>`

## Purpose
Define a custom user function for use in other expressions.

## Remarks
User functions may call other user functions but circular calls will
result in a stack overflow.

## Example
```text
10 LET PI=3.14159
20 DEF FNDEG(RADIANS)=RADIANS*180/PI
30 PRINT FNDEG(COS(0.707))
RUN
 43.562813
```
*/