#include <unordered_map>

class C {};

int main() {
	C c;
	std::unordered_map<C*, int> m;
	m.insert({&c, 0});   // no matching function for call to 'get'
	return 0;
}

	m.insert(std::pair{&c, "hello"});

#include <regex>

int main() {
	static std::regex rColor {"^#?[0-9A-Fa-f]{6}$"};
	return 0;
}

$ clang -std=c++23 -c try.cpp 
In file included from try.cpp:1:
In file included from /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/regex:40:
In file included from /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bitset:52:
In file included from /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/string:67:
In file included from /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/memory_resource.h:41:
In file included from /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/uses_allocator_args.h:39:
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/tuple:956:36: error: no matching function for call to 'get'
  956 |             return __convertible<decltype(std::get<_Is>(std::declval<_UTuple>()))...>();
      |                                           ^~~~~~~~~~~~~
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/tuple:955:11: note: in instantiation of function template specialization 'std::tuple<const long &>::__convertible_from_tuple_like()::(anonymous class)::operator()<0UL>' requested here
  955 |           return []<size_t... _Is>(index_sequence<_Is...>) {
      |                  ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/tuple:1136:22: note: in instantiation of function template specialization 'std::tuple<const long &>::__convertible_from_tuple_like<const long &>' requested here
 1136 |         constexpr explicit(!__convertible_from_tuple_like<_UTuple>())
      |                             ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_map.h:514:38: note: while substituting deduced template arguments into function template 'tuple' [with _UTuple = const key_type &]
  514 |                                             std::tuple<const key_type&>(__k),
      |                                                                         ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/regex_automaton.tcc:207:7: note: in instantiation of member function 'std::map<long, long>::operator[]' requested here
  207 |           __m[__u] = __id;
      |              ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/regex_compiler.tcc:241:24: note: in instantiation of member function 'std::__detail::_StateSeq<std::regex_traits<char>>::_M_clone' requested here
  241 |             __e._M_append(__r._M_clone());
      |                               ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/regex_compiler.tcc:135:17: note: (skipping 2 contexts in backtrace; use -ftemplate-backtrace-limit=0 to see all)
  135 |           while (this->_M_quantifier())
      |                        ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/regex_compiler.tcc:91:13: note: in instantiation of member function 'std::__detail::_Compiler<std::regex_traits<char>>::_M_alternative' requested here
   91 |       this->_M_alternative();
      |             ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/regex_compiler.tcc:76:13: note: in instantiation of member function 'std::__detail::_Compiler<std::regex_traits<char>>::_M_disjunction' requested here
   76 |       this->_M_disjunction();
      |             ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/regex.h:809:34: note: in instantiation of member function 'std::__detail::_Compiler<std::regex_traits<char>>::_Compiler' requested here
  809 |         __detail::_Compiler<_Rx_traits> __c(__first, __last, _M_loc, __f);
      |                                         ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/regex.h:473:9: note: in instantiation of member function 'std::basic_regex<char>::_M_compile' requested here
  473 |       { _M_compile(__p, __p + _Rx_traits::length(__p), __f); }
      |         ^
try.cpp:14:26: note: in instantiation of member function 'std::basic_regex<char>::basic_regex' requested here
   14 |         static const std::regex shmNameRegex {"^/[^/]{1,254}$"};
      |                                 ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:122:5: note: candidate template ignored: could not match 'tuple<_Elements...>' against 'const long'
  122 |     get(tuple<_Elements...>& __t) noexcept;
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:126:5: note: candidate template ignored: could not match 'const tuple<_Elements...>' against 'const long'
  126 |     get(const tuple<_Elements...>& __t) noexcept;
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:130:5: note: candidate template ignored: could not match 'tuple<_Elements...>' against 'const long'
  130 |     get(tuple<_Elements...>&& __t) noexcept;
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:134:5: note: candidate template ignored: could not match 'const tuple<_Elements...>' against 'const long'
  134 |     get(const tuple<_Elements...>&& __t) noexcept;
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:138:5: note: candidate template ignored: could not match 'array<_Tp, _Nm>' against 'const long'
  138 |     get(array<_Tp, _Nm>&) noexcept;
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:142:5: note: candidate template ignored: could not match 'array<_Tp, _Nm>' against 'const long'
  142 |     get(array<_Tp, _Nm>&&) noexcept;
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:146:5: note: candidate template ignored: could not match 'const array<_Tp, _Nm>' against 'const long'
  146 |     get(const array<_Tp, _Nm>&) noexcept;
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:150:5: note: candidate template ignored: could not match 'const array<_Tp, _Nm>' against 'const long'
  150 |     get(const array<_Tp, _Nm>&&) noexcept;
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:1250:5: note: candidate template ignored: could not match 'pair<_Tp1, _Tp2>' against 'const long'
 1250 |     get(pair<_Tp1, _Tp2>& __in) noexcept
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:1255:5: note: candidate template ignored: could not match 'pair<_Tp1, _Tp2>' against 'const long'
 1255 |     get(pair<_Tp1, _Tp2>&& __in) noexcept
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:1260:5: note: candidate template ignored: could not match 'const pair<_Tp1, _Tp2>' against 'const long'
 1260 |     get(const pair<_Tp1, _Tp2>& __in) noexcept
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:1265:5: note: candidate template ignored: could not match 'const pair<_Tp1, _Tp2>' against 'const long'
 1265 |     get(const pair<_Tp1, _Tp2>&& __in) noexcept
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/ranges_util.h:444:5: note: candidate template ignored: could not match 'const subrange<_It, _Sent, _Kind>' against 'const long'
  444 |     get(const subrange<_It, _Sent, _Kind>& __r)
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/ranges_util.h:455:5: note: candidate template ignored: could not match 'subrange<_It, _Sent, _Kind>' against 'const long'
  455 |     get(subrange<_It, _Sent, _Kind>&& __r)
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:1272:5: note: candidate template ignored: invalid explicitly-specified argument for template parameter '_Tp'
 1272 |     get(pair<_Tp, _Up>& __p) noexcept
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:1277:5: note: candidate template ignored: invalid explicitly-specified argument for template parameter '_Tp'
 1277 |     get(const pair<_Tp, _Up>& __p) noexcept
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:1282:5: note: candidate template ignored: invalid explicitly-specified argument for template parameter '_Tp'
 1282 |     get(pair<_Tp, _Up>&& __p) noexcept
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:1287:5: note: candidate template ignored: invalid explicitly-specified argument for template parameter '_Tp'
 1287 |     get(const pair<_Tp, _Up>&& __p) noexcept
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:1292:5: note: candidate template ignored: invalid explicitly-specified argument for template parameter '_Tp'
 1292 |     get(pair<_Up, _Tp>& __p) noexcept
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:1297:5: note: candidate template ignored: invalid explicitly-specified argument for template parameter '_Tp'
 1297 |     get(const pair<_Up, _Tp>& __p) noexcept
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:1302:5: note: candidate template ignored: invalid explicitly-specified argument for template parameter '_Tp'
 1302 |     get(pair<_Up, _Tp>&& __p) noexcept
      |     ^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/14.1.1/../../../../include/c++/14.1.1/bits/stl_pair.h:1307:5: note: candidate template ignored: invalid explicitly-specified argument for template parameter '_Tp'
 1307 |     get(const pair<_Up, _Tp>&& __p) noexcept
      |     ^
1 error generated.

May 17 18:09:26 fedora kernel: BUG: unable to handle page fault for address: ffff8da33f8e3f48
May 17 18:09:26 fedora kernel: #PF: supervisor write access in kernel mode
May 17 18:09:26 fedora kernel: #PF: error_code(0x0002) - not-present page

echo $?
find / -xdev -type d 2>/dev/null | grep -P "^/opt/ibm/.*?/jre/lib$" | while read path; do if test -r "$path" && test -x "$path"; then filenames=`ls -1A "$path" 2>/dev/null | grep -x $'version.properties'; exit ${PIPESTATUS[0]};`; if [ "$?" != 0 ]; then exit 1; fi; IFS=$'\n'; for filename in $filenames; do filepath="$path"/"$filename"; if [ "$path" == "/" ]; then filepath="/$filename"; fi; if test -e "$filepath" && test ! -d "$filepath"; then perms=$(ls -ldL "$filepath" | cut -d \  -f 2 | tr -d '\n'; exit ${PIPESTATUS[0]};); if [ "$?" != 0 ]; then exit 1; fi; stats=$(stat -L --format="%A:%g:%u:%X:%Y:%Z:%s:%a" "$filepath" | tr -d '\n'; exit ${PIPESTATUS[0]};); if [ "$?" != 0 ]; then exit 1; fi; printf "%s:%s:%s\n" "$filepath" "$stats" "$perms"; ((i++)); if [ $i -ge 1024 ]; then break 2; fi; fi; done; fi; done;
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err=`( failover info ) 2>&1 >/dev/tty`; code=$?; printf "\n[[[d]]]\n%s\n[[[d]]]\n%s\n" "$code" "$err";
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( path=$'/etc'; depth=0; rc_list_files() { local path="$1"; local depth="$2"; local filenames=`ls -1A "$path"`; if [ "$?" != 0 ]; then exit 1; fi; IFS=$'\n'; for filename in $filenames; do local filepath="$path"/"$filename"; if [ "$path" == "/" ]; then filepath=/"$filename"; fi; if test -f "$filepath" && test -r "$filepath"; then if ( grep -P "^(rosa-)?release$" <<< "$filename" > /dev/null ); then printf "%s\n" "$filepath"; ((fc++)); if [ $fc -ge 1024 ]; then exit 0; fi; fi; fi; if [ -d "$filepath" ] && [ -r "$filepath" ] && [ -x "$filepath" ]; then if [ "$depth" -ge 0 ]; then depth=$(( depth - 1 )); fi; if [ "$depth" -eq -1024 ] || [ "$depth" -ge 0 ]; then rc_list_files "$filepath" "$depth"; fi; fi; done; }; if [ "$depth" -le -1 ]; then depth=-1024; fi; if test -d "$path" && test -r "$path"; then rc_list_files "$path" "$depth"; fi; );
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( path=$'/usr/java'; depth=5; rc_list_files() { local path="$1"; local depth="$2"; local filenames=`ls -1A "$path"`; if [ "$?" != 0 ]; then exit 1; fi; IFS=$'\n'; for filename in $filenames; do local filepath="$path"/"$filename"; if [ "$path" == "/" ]; then filepath=/"$filename"; fi; if test -e "$filepath" && test ! -d "$filepath"; then if [ "$filename" == $'java' ]; then perms=$(ls -ldL "$filepath" | cut -d \  -f 2 | tr -d '\n'; exit ${PIPESTATUS[0]};); if [ "$?" != 0 ]; then exit 1; fi; stats=$(stat -L --format="%A:%g:%u:%X:%Y:%Z:%s:%a" "$filepath" | tr -d '\n'; exit ${PIPESTATUS[0]};); if [ "$?" != 0 ]; then exit 1; fi; printf "%s:%s:%s\n" "$filepath" "$stats" "$perms"; ((fc++)); if [ $fc -ge 1024 ]; then exit 0; fi; fi; fi; if [ -d "$filepath" ] && [ -r "$filepath" ] && [ -x "$filepath" ]; then if [ "$depth" -ge 0 ]; then depth=$(( depth - 1 )); fi; if [ "$depth" -eq -1024 ] || [ "$depth" -ge 0 ]; then rc_list_files "$filepath" "$depth"; fi; fi; done; }; if [ "$depth" -le -1 ]; then depth=-1024; fi; if test -d "$path" && test -r "$path"; then rc_list_files "$path" "$depth"; fi; );
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( path=$'/home'; depth=5; rc_list_files() { local path="$1"; local depth="$2"; local filenames=`ls -1A "$path"`; if [ "$?" != 0 ]; then exit 1; fi; IFS=$'\n'; for filename in $filenames; do local filepath="$path"/"$filename"; if [ "$path" == "/" ]; then filepath=/"$filename"; fi; if test -e "$filepath" && test ! -d "$filepath"; then if [ "$filename" == $'java' ]; then perms=$(ls -ldL "$filepath" | cut -d \  -f 2 | tr -d '\n'; exit ${PIPESTATUS[0]};); if [ "$?" != 0 ]; then exit 1; fi; stats=$(stat -L --format="%A:%g:%u:%X:%Y:%Z:%s:%a" "$filepath" | tr -d '\n'; exit ${PIPESTATUS[0]};); if [ "$?" != 0 ]; then exit 1; fi; printf "%s:%s:%s\n" "$filepath" "$stats" "$perms"; ((fc++)); if [ $fc -ge 1024 ]; then exit 0; fi; fi; fi; if [ -d "$filepath" ] && [ -r "$filepath" ] && [ -x "$filepath" ]; then if [ "$depth" -ge 0 ]; then depth=$(( depth - 1 )); fi; if [ "$depth" -eq -1024 ] || [ "$depth" -ge 0 ]; then rc_list_files "$filepath" "$depth"; fi; fi; done; }; if [ "$depth" -le -1 ]; then depth=-1024; fi; if test -d "$path" && test -r "$path"; then rc_list_files "$path" "$depth"; fi; );
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( path=$'/usr/opt'; depth=5; rc_list_files() { local path="$1"; local depth="$2"; local filenames=`ls -1A "$path"`; if [ "$?" != 0 ]; then exit 1; fi; IFS=$'\n'; for filename in $filenames; do local filepath="$path"/"$filename"; if [ "$path" == "/" ]; then filepath=/"$filename"; fi; if test -e "$filepath" && test ! -d "$filepath"; then if [ "$filename" == $'java' ]; then perms=$(ls -ldL "$filepath" | cut -d \  -f 2 | tr -d '\n'; exit ${PIPESTATUS[0]};); if [ "$?" != 0 ]; then exit 1; fi; stats=$(stat -L --format="%A:%g:%u:%X:%Y:%Z:%s:%a" "$filepath" | tr -d '\n'; exit ${PIPESTATUS[0]};); if [ "$?" != 0 ]; then exit 1; fi; printf "%s:%s:%s\n" "$filepath" "$stats" "$perms"; ((fc++)); if [ $fc -ge 1024 ]; then exit 0; fi; fi; fi; if [ -d "$filepath" ] && [ -r "$filepath" ] && [ -x "$filepath" ]; then if [ "$depth" -ge 0 ]; then depth=$(( depth - 1 )); fi; if [ "$depth" -eq -1024 ] || [ "$depth" -ge 0 ]; then rc_list_files "$filepath" "$depth"; fi; fi; done; }; if [ "$depth" -le -1 ]; then depth=-1024; fi; if test -d "$path" && test -r "$path"; then rc_list_files "$path" "$depth"; fi; );
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test -f $'/usr/local/nagiosfusion/var/fusionversion' && test -r $'/usr/local/nagiosfusion/var/fusionversion'; echo $?;
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( path=$'/opt'; depth=1; rc_list_files() { local path="$1"; local depth="$2"; local filenames=`ls -1A "$path"`; if [ "$?" != 0 ]; then exit 1; fi; IFS=$'\n'; for filename in $filenames; do local filepath="$path"/"$filename"; if [ "$path" == "/" ]; then filepath=/"$filename"; fi; if test -e "$filepath" && test ! -d "$filepath"; then if [ "$filename" == $'components.xml' ]; then perms=$(ls -ldL "$filepath" | cut -d \  -f 2 | tr -d '\n'; exit ${PIPESTATUS[0]};); if [ "$?" != 0 ]; then exit 1; fi; stats=$(stat -L --format="%A:%g:%u:%X:%Y:%Z:%s:%a" "$filepath" | tr -d '\n'; exit ${PIPESTATUS[0]};); if [ "$?" != 0 ]; then exit 1; fi; printf "%s:%s:%s\n" "$filepath" "$stats" "$perms"; ((fc++)); if [ $fc -ge 1024 ]; then exit 0; fi; fi; fi; if [ -d "$filepath" ] && [ -r "$filepath" ] && [ -x "$filepath" ]; then if [ "$depth" -ge 0 ]; then depth=$(( depth - 1 )); fi; if [ "$depth" -eq -1024 ] || [ "$depth" -ge 0 ]; then rc_list_files "$filepath" "$depth"; fi; fi; done; }; if [ "$depth" -le -1 ]; then depth=-1024; fi; if test -d "$path" && test -r "$path"; then rc_list_files "$path" "$depth"; fi; );
echo $?
err=`( grep -n -e "DocumentRoot" /etc/apache2/sites-available/default-ssl.conf ) 2>&1 >/dev/tty`; code=$?; printf "\n[[[d]]]\n%s\n[[[d]]]\n%s\n" "$code" "$err";
err=`( grep -n -e "DocumentRoot" /etc/httpd/conf/httpd.conf ) 2>&1 >/dev/tty`; code=$?; printf "\n[[[d]]]\n%s\n[[[d]]]\n%s\n" "$code" "$err";
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command -v find
echo $?
find / -xdev -type d 2>/dev/null | grep -P "^/opt/ibm/.*?/jre/lib$" | while read path; do if test -r "$path" && test -x "$path"; then filenames=`ls -1A "$path" 2>/dev/null | grep -x $'version.properties'; exit ${PIPESTATUS[0]};`; if [ "$?" != 0 ]; then exit 1; fi; IFS=$'\n'; for filename in $filenames; do filepath="$path"/"$filename"; if [ "$path" == "/" ]; then filepath="/$filename"; fi; if test -e "$filepath" && test ! -d "$filepath"; then perms=$(ls -ldL "$filepath" | cut -d \  -f 2 | tr -d '\n'; exit ${PIPESTATUS[0]};); if [ "$?" != 0 ]; then exit 1; fi; stats=$(stat -L --format="%A:%g:%u:%X:%Y:%Z:%s:%a" "$filepath" | tr -d '\n'; exit ${PIPESTATUS[0]};); if [ "$?" != 0 ]; then exit 1; fi; printf "%s:%s:%s\n" "$filepath" "$stats" "$perms"; ((i++)); if [ $i -ge 1024 ]; then break 2; fi; fi; done; fi; done;
echo $?
err=`( failover info ) 2>&1 >/dev/tty`; code=$?; printf "\n[[[d]]]\n%s\n[[[d]]]\n%s\n" "$code" "$err";
test -f $'/etc/SuSE-brand' && test -r $'/etc/SuSE-brand'; echo $?;
err=`( /usr/local/nagios/bin/nagios ) 2>&1 >/dev/tty`; code=$?; printf "\n[[[d]]]\n%s\n[[[d]]]\n%s\n" "$code" "$err";
err=`( find "/opt" "/usr/lib" "/usr/lib64" -path "*/bin/*" -type f -name "qmake" -exec {} --version \;  2>/dev/null | grep "Qt version" ) 2>&1 >/dev/tty`; code=$?; printf "\n[[[d]]]\n%s\n[[[d]]]\n%s\n" "$code" "$err";

Человек точно не будет такое писать)
Сервер не я настраивал.