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$ g++ -std=gnu++11 -Wno-deprecated-register parser.tab.c -o $@ -ll -ly parser.y: In function ‘int yyparse()’: parser.y:444:58: error: no match for ‘operator=’ (operand types are ‘content’ and ‘int’) 444 | $$ = lookup($1); | ^ parser.y:25:8: note: candidate: ‘content& content::operator=(const content&)’ 25 | struct content { | ^~~~~~~ parser.y:25:8: note: no known conversion for argument 1 from ‘int’ to ‘const content&’ parser.y:25:8: note: candidate: ‘content& content::operator=(content&&)’ parser.y:25:8: note: no known conversion for argument 1 from ‘int’ to ‘content&&’ parser.y:447:31: error: cannot convert ‘content’ to ‘int’ in assignment 447 | a.value.ival = $$; | ~~~ ^ | | | content parser.y:451:61: error: no match for ‘operator=’ (operand types are ‘content’ and ‘int’) 451 | $$=-$2; | ^ parser.y:25:8: note: candidate: ‘content& content::operator=(const content&)’ 25 | struct content { | ^~~~~~~ parser.y:25:8: note: no known conversion for argument 1 from ‘int’ to ‘const content&’ parser.y:25:8: note: candidate: ‘content& content::operator=(content&&)’ parser.y:25:8: note: no known conversion for argument 1 from ‘int’ to ‘content&&’ parser.y:457:65: error: no match for ‘operator+’ (operand types are ‘content’ and ‘content’) 457 | $$ = $1 + $3; | ^ | | | | content content In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/stl_algobase.h:67, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/char_traits.h:39, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/stl_iterator.h:568:5: note: candidate: ‘template<class _Iterator> std::reverse_iterator<_Iterator> std::operator+(typename std::reverse_iterator<_Iterator>::difference_type, const std::reverse_iterator<_Iterator>&)’ 568 | operator+(typename reverse_iterator<_Iterator>::difference_type __n, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/stl_iterator.h:568:5: note: template argument deduction/substitution failed: parser.y:457:89: note: ‘content’ is not derived from ‘const std::reverse_iterator<_Iterator>’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/stl_algobase.h:67, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/char_traits.h:39, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/stl_iterator.h:1646:5: note: candidate: ‘template<class _Iterator> std::move_iterator<_IteratorL> std::operator+(typename std::move_iterator<_IteratorL>::difference_type, const std::move_iterator<_IteratorL>&)’ 1646 | operator+(typename move_iterator<_Iterator>::difference_type __n, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/stl_iterator.h:1646:5: note: template argument deduction/substitution failed: parser.y:457:89: note: ‘content’ is not derived from ‘const std::move_iterator<_IteratorL>’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/string:55, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/locale_classes.h:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/ios_base.h:41, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:42, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6095:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)’ 6095 | operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6095:5: note: template argument deduction/substitution failed: parser.y:457:89: note: ‘content’ is not derived from ‘const std::basic_string<_CharT, _Traits, _Alloc>’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/string:56, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/locale_classes.h:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/ios_base.h:41, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:42, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.tcc:1169:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)’ 1169 | operator+(const _CharT* __lhs, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.tcc:1169:5: note: template argument deduction/substitution failed: parser.y:457:89: note: mismatched types ‘const _CharT*’ and ‘content’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/string:56, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/locale_classes.h:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/ios_base.h:41, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:42, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.tcc:1189:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(_CharT, const std::basic_string<_CharT, _Traits, _Alloc>&)’ 1189 | operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.tcc:1189:5: note: template argument deduction/substitution failed: parser.y:457:89: note: ‘content’ is not derived from ‘const std::basic_string<_CharT, _Traits, _Alloc>’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/string:55, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/locale_classes.h:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/ios_base.h:41, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:42, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6132:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)’ 6132 | operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6132:5: note: template argument deduction/substitution failed: parser.y:457:89: note: ‘content’ is not derived from ‘const std::basic_string<_CharT, _Traits, _Alloc>’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/string:55, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/locale_classes.h:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/ios_base.h:41, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:42, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6148:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, _CharT)’ 6148 | operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs) | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6148:5: note: template argument deduction/substitution failed: parser.y:457:89: note: ‘content’ is not derived from ‘const std::basic_string<_CharT, _Traits, _Alloc>’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/string:55, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/locale_classes.h:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/ios_base.h:41, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:42, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6160:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::basic_string<_CharT, _Traits, _Alloc>&&, const std::basic_string<_CharT, _Traits, _Alloc>&)’ 6160 | operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6160:5: note: template argument deduction/substitution failed: parser.y:457:89: note: ‘content’ is not derived from ‘std::basic_string<_CharT, _Traits, _Alloc>’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/string:55, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/locale_classes.h:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/ios_base.h:41, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:42, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6166:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, std::basic_string<_CharT, _Traits, _Alloc>&&)’ 6166 | operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6166:5: note: template argument deduction/substitution failed: parser.y:457:89: note: ‘content’ is not derived from ‘const std::basic_string<_CharT, _Traits, _Alloc>’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/string:55, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/locale_classes.h:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/ios_base.h:41, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:42, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6172:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::basic_string<_CharT, _Traits, _Alloc>&&, std::basic_string<_CharT, _Traits, _Alloc>&&)’ 6172 | operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6172:5: note: template argument deduction/substitution failed: parser.y:457:89: note: ‘content’ is not derived from ‘std::basic_string<_CharT, _Traits, _Alloc>’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/string:55, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/locale_classes.h:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/ios_base.h:41, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:42, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6194:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const _CharT*, std::basic_string<_CharT, _Traits, _Alloc>&&)’ 6194 | operator+(const _CharT* __lhs, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6194:5: note: template argument deduction/substitution failed: parser.y:457:89: note: mismatched types ‘const _CharT*’ and ‘content’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/string:55, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/locale_classes.h:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/ios_base.h:41, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:42, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6200:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(_CharT, std::basic_string<_CharT, _Traits, _Alloc>&&)’ 6200 | operator+(_CharT __lhs, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6200:5: note: template argument deduction/substitution failed: parser.y:457:89: note: ‘content’ is not derived from ‘std::basic_string<_CharT, _Traits, _Alloc>’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/string:55, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/locale_classes.h:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/ios_base.h:41, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:42, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6206:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::basic_string<_CharT, _Traits, _Alloc>&&, const _CharT*)’ 6206 | operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6206:5: note: template argument deduction/substitution failed: parser.y:457:89: note: ‘content’ is not derived from ‘std::basic_string<_CharT, _Traits, _Alloc>’ 457 | $$ = $1 + $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/string:55, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/locale_classes.h:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/ios_base.h:41, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:42, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6212:5: note: candidate: ‘template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::basic_string<_CharT, _Traits, _Alloc>&&, _CharT)’ 6212 | operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/basic_string.h:6212:5: note: template argument deduction/substitution failed: parser.y:457:89: note: ‘content’ is not derived from ‘std::basic_string<_CharT, _Traits, _Alloc>’ 457 | $$ = $1 + $3; | ^ parser.y:460:65: error: no match for ‘operator-’ (operand types are ‘content’ and ‘content’) 460 | $$ = $1 - $3; | ^ | | | | content content In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/stl_algobase.h:67, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/char_traits.h:39, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/stl_iterator.h:560:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> decltype ((__y.base() - __x.base())) std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)’ 560 | operator-(const reverse_iterator<_IteratorL>& __x, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/stl_iterator.h:560:5: note: template argument deduction/substitution failed: parser.y:460:89: note: ‘content’ is not derived from ‘const std::reverse_iterator<_Iterator>’ 460 | $$ = $1 - $3; | ^ In file included from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/stl_algobase.h:67, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/char_traits.h:39, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ios:40, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/ostream:38, from /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/iostream:39, from parser.y:6: /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/stl_iterator.h:1639:5: note: candidate: ‘template<class _IteratorL, class _IteratorR> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)’ 1639 | operator-(const move_iterator<_IteratorL>& __x, | ^~~~~~~~ /usr/lib/gcc/x86_64-pc-cygwin/11/include/c++/bits/stl_iterator.h:1639:5: note: template argument deduction/substitution failed: parser.y:460:89: note: ‘content’ is not derived from ‘const std::move_iterator<_IteratorL>’ 460 | $$ = $1 - $3; | ^ parser.y:463:65: error: no match for ‘operator*’ (operand types are ‘content’ and ‘content’) 463 | $$ = $1 * $3; | ^ | | | | content content parser.y:466:65: error: no match for ‘operator/’ (operand types are ‘content’ and ‘content’) 466 | $$ = $1 / $3; | ^ | | | | content content parser.y:469:65: error: no match for ‘operator%’ (operand types are ‘content’ and ‘content’) 469 | $$ = $1 % $3; | ^ | | | | content content parser.y:565:40: error: no match for ‘operator=’ (operand types are ‘content’ and ‘int’) 565 | $$ = a.value.ival; | ^ parser.y:25:8: note: candidate: ‘content& content::operator=(const content&)’ 25 | struct content { | ^~~~~~~ parser.y:25:8: note: no known conversion for argument 1 from ‘int’ to ‘const content&’ parser.y:25:8: note: candidate: ‘content& content::operator=(content&&)’ parser.y:25:8: note: no known conversion for argument 1 from ‘int’ to ‘content&&’ parser.y:573:48: error: no match for ‘operator=’ (operand types are ‘content’ and ‘int’) 573 | $$ = a.value.ival; | ^ parser.y:25:8: note: candidate: ‘content& content::operator=(const content&)’ 25 | struct content { | ^~~~~~~ parser.y:25:8: note: no known conversion for argument 1 from ‘int’ to ‘const content&’ parser.y:25:8: note: candidate: ‘content& content::operator=(content&&)’ parser.y:25:8: note: no known conversion for argument 1 from ‘int’ to ‘content&&’ parser.y:628:50: error: no match for ‘operator=’ (operand types are ‘content’ and ‘int’) 628 | $$ = lookup($1); | ^ parser.y:25:8: note: candidate: ‘content& content::operator=(const content&)’ 25 | struct content { | ^~~~~~~ parser.y:25:8: note: no known conversion for argument 1 from ‘int’ to ‘const content&’ parser.y:25:8: note: candidate: ‘content& content::operator=(content&&)’ parser.y:25:8: note: no known conversion for argument 1 from ‘int’ to ‘content&&’ parser.y:631:31: error: cannot convert ‘content’ to ‘int’ in assignment 631 | a.value.ival = $$; | ~~~ ^ | | | content At global scope: cc1plus: note: unrecognized command-line option ‘-Wno-deprecated-register’ may have been intended to silence earlier diagnostics