Infinite IDE crash loop when interface has members foo and _foo

[fafalone]

Describe the bug
This was originally identified in a derived interface, but applies within a single interface as well:

Normally names starting with an underscore work fine, except when there's already a method with the same name without the underscore;

3:41:03.390
0001 03:41:03.381 NATIVE EXCEPTION: ACCESS_VIOLATION  {no-basic-code}
     thread 0009: CompilerOrganizationParsingEnd
     thread 0008: CompilerPackageIntellisenseAwaiting
     thread 0007: CompilerPackageIntellisenseAwaiting
     thread 0006: CompilerPackageIntellisenseAwaiting
     thread 0005: CompilerPackageIntellisenseAwaiting
 >>> thread 0004: IntellisenseAfterCompilationStart
     thread 0003: CompilerPackageIntellisenseAwaiting
     thread 0002: ProjectPushCustomControlsToClientEnd

That error repeats until the safe mode breakout kicks in.

To Reproduce
New StdExe:

[InterfaceId("08DD6ADC-728D-4774-A13B-AEF6E1ACE8FC")]
Interface IFoo Extends IUnknown
    Sub test1(ByVal a As Long)
    Sub test2(ByVal a As Long)
    Sub test3(ByVal a As Long)
    Sub test2(ByVal a As Long)    
End Interface

Then rename the second test2 by putting an underscore to make it _test2

Expected behavior
At the very least, this shouldn't cause a crash loop. Ideally it should work with both of them: This issue came up defining the Windows SDK provided version of IBrowserService and IBrowserService2. The first one has NavigateToPidl, the second inherits from the first and has _NavigateToPidl.
It could be renamed if proper support would require major changes, but ideally since tB is trying to support leading underscores in names it should be possible as-is.

Screenshots
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Desktop (please complete the following information):

• OS: Windows 10
• twinBASIC compiler version 0.15.487

Additional context
Add any other context about the problem here.

[WaynePhillipsEA]

Fixed in BETA 494. Thanks