Nested #if/#endif problems

[rtldg]

Nested if/endif pairs used to work in SM 1.11 like this:

public void OnPluginStart()
{
#if 0
#if 0
	PrintToServer("foo bar");
#endif
#endif
}

In 1.12 (master branch of this repo) it does this:

> .\spcomp.exe .\test_if_endif.sp
SourcePawn Compiler 1.12
Copyright (c) 1997-2006 ITB CompuPhase
Copyright (c) 2004-2021 AlliedModders LLC

.\test_if_endif.sp(1) : error 001: expected token: "#endif", but found "-end of file-"

.\test_if_endif.sp(9) : error 030: compound statement not closed at the end of file (started at line 9)
     9 | }
----------^

2 Errors.

(or something like this with the latest sm 1.12 7164 build)

// H:\steamcmd\cstrike\cstrike\addons\sourcemod\scripting\include\entity_prop_stocks.inc(590) : error 030: compound statement not closed at the end of file (started at line 590)
//    590 | }
// ---------^
//
// .\test_if_endif.sp(1) : error 001: expected token: "#endif", but found "-end of file-"
//
// 2 Errors.
//
// Compilation Time: 0.22 sec
// ----------------------------------------

this will still error:

public void OnPluginStart()
{
#if 0
#if 1
	PrintToServer("foo bar");
#endif
#endif
}

this will work:

public void OnPluginStart()
{
#if 1
#if 0
	PrintToServer("foo bar");
#endif
#endif
}

This might:tm: be intended now but I expect that it's probably not