can't preprocess "statement replacement macros" while unrolling

[Andre-LA]

Bug description

The compiler can't generate code with statement replacement macros inside a loop unrolling scope

Code example

## local function macrox(x)
  print(#[x]#)
## end

## for i = 1, 20 do
  #[macrox]#(10)
## end

output:

$ nelua test.nelua 
test.nelua:7:3: error: cannot convert preprocess value of type "function" to an AST node
  #[macrox]#(10)
  ^~~~~~~~~~

Expected behavior

The same behaviour as repeating the code manually.

Workaround

Wrap the statement replacement macro with a runtime function:

## local function macrox(x)
  print(#[x]#)
## end

local function macro_x(x: auto)
  #[macrox]#(x)
end

## for i = 1, 20 do
  macro_x(10)
## end

Environment

Provide relevant information about your environment:

• Nelua version: 0.2.0-dev.1365+e6a91c19
• Pop!_OS 21.04 (Ubuntu)
• Architecture: x86_64

[edubart]

You have discovered a flaw in the replacement macro system, thanks for reporting this. I've fixed in commit 7096f16