Internal unhandled exception - access violation -> crash

FPC🤖Trunk

program test;
{$modeswitch implicitfunctionspecialization}

generic procedure FillChar<T>(var x; count: SizeInt; value: Byte);
begin
end;

var v: array [0..0] of Byte;

begin
  FillChar(v, 0, 0);
end.

Compile:

C:\fpclaztrunk\fpc\bin\x86_64-win64\fpc.exe -n -FuC:\fpclaztrunk\fpc\units\x86_64-win64\rtl -O3 -gl test.pas

Output:

test.pas(10,1) Error: Compilation raised exception internally
Fatal: Compilation aborted
An unhandled exception occurred at $0000000100002D4D:
EAccessViolation: Access violation
  $0000000100002D4D  fpc_shortstr_to_shortstr,  line 812 of ../inc/generic.inc
  $0000000100063F3F  GETREALNAME,  line 204 of symbase.pas
  $0000000100080948  TYPENAME,  line 412 of symtype.pas
  $00000001002410C0  BEFOREAPPENDDEF,  line 1824 of dbgdwarf.pas
  $000000010005A6A6  APPENDDEF,  line 243 of dbgbase.pas
  $000000010005AE23  WRITE_SYMTABLE_DEFS,  line 490 of dbgbase.pas
  $0000000100245E8F  INSERTTYPEINFO,  line 3343 of dbgdwarf.pas
  $000000010020117B  PROC_PROGRAM_AFTER_PARSING,  line 2431 of pmodules.pas
  $0000000100201AF6  PROC_PROGRAM_DECLARATIONS,  line 2711 of pmodules.pas
  $000000010020230D  PROC_PROGRAM,  line 2960 of pmodules.pas
  $0000000100043925  COMPILE_MODULE,  line 488 of parser.pas
  $0000000100062268  CONTINUE,  line 269 of ctask.pas
  $0000000100062406  PROCESSQUEUE,  line 334 of ctask.pas
  $000000010001B0AC  COMPILE,  line 311 of compiler.pas
  $0000000100001ABD  main,  line 308 of pp.pas
  $00000001000027A6  MAIN_WRAPPER
  $0000000100013B80  EXE_ENTRY,  line 83 of x86_64/cpuwin.inc