Bug when closing parethesis is placed in new line for ## print()

[stefanos82]

Bug description

When I place the closing parenthesis of ## print() in a new line, it breaks.

t.nelua:8:1: syntax error: unexpected syntax
)
^

shell returned 1

I'm trying to print the type(s) of nested records and caused a bug by mistake.

Code example

Provide minimal reproduction code to test the bug. Please, format the code properly and try to keep it as simple as possible, just focusing on the experienced bug.

require 'string'

local A = @record{}
global A.B = @record{ x: integer}

## print(string.format("A.type: '%s'\nA.value.metafields.B: '%s'", A.type, A.value.metafields.B))

The problematic code looks like this:

require 'string'

local A = @record{}
global A.B = @record{ x: integer}

## print(
    string.format("A.type: '%s'\nA.value.metafields.B: '%s'", A.type, A.value.metafields.B)
)

Expected behavior

It should print

A.type: 'type'
A.value.metafields.B: 'A.B: type = A.B'

Workaround

If you have already found a way to workaround the issue, then please share how you did it, this may help others with the same issue.

Environment

Provide relevant information about your environment:

• Nelua version:

  Nelua 0.2.0-dev
  Build number: 1268
  Git date: 2021-08-27 13:07:25 -0300
  Git hash: 97d5c391e12bb16b026e9d636b49ea18a42a8fd1
  Copyright (C) 2019-2021 Eduardo Bart (https://nelua.io/)

• Platform: GNU / Linux Debian
• Architecture: Linux debian 5.10.0-3-amd64 #1 SMP Debian 5.10.13-1 (2021-02-06) x86_64 GNU/Linux
• C compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110

[codehz]

I think it is expected. you need to use ##[[ ]] syntax for multiline preprocess

[stefanos82]

Indeed; good catch @codehz

[Andre-LA]

Indeed, however it doesn't need the ## at the end, just ##[[ ]] works¹, it follows the same rules as comments actually, so ##[==[ ]==] can be used to avoid some [[ ]] conflict²:

¹ https://nelua.io/overview/#preprocessor ² https://nelua.io/overview/#preprocessor-code-blocks