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Calling back() on an empty string is not allowed and triggers an assert with recent gcc: $ cd manual/PRESENTATION_Intro $ ../../yosys counter.ys ... /usr/include/c++/8/bits/basic_string.h:1136: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::back() [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::reference = char&]: Assertion '!empty()' failed. 802 if (label.back() == ':' && GetSize(label) > 1) (gdb) p label $1 = ""