Declaring functions with #fn

From v0.11.14 onwards

Functions can be called from any expression context with simple syntax. This is different from #ruledef rules, which need to be wrapped into an asm block in order to be resolved. Furthermore, functions currently only receive untyped values, and can't take token arguments.

The syntax for declaring functions is:

#fn name(param1, param2, param3) => expression

As usual, you may expand the expression part into a block, and the last expression in the block is automatically returned:

#fn name(param1, param2, param3) =>
{
    expressions
}

For example, the following code will output 0x01:

#fn add1(value) => value + 1

#d8 add1(0)