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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`testrunner` asserts on MSYS MINGW64","articleBody":"Encountered while working on #475.\n\n```\nC:/msys64/mingw64/include/c++/15.1.0/bits/basic_string.h:1349: std::__cxx11::basic_string\u003c_CharT, _Traits, _Alloc\u003e::const_reference std::__cxx11::basic_string\u003c_CharT, _Traits, _Alloc\u003e::operator[](size_type) const [with _CharT = char; _Traits = std::char_traits\u003cchar\u003e; _Alloc = std::allocator\u003cchar\u003e; const_reference = const char\u0026; size_type = long long unsigned int]: Assertion '__pos \u003c= size()' failed.\n```\n\nI can reproduce it locally but for some reason the assertion does not break into the debugger so I have no trace. And I cannot reproduce it in a non-MSYS2 MinGW.","author":{"url":"https://github.com/firewave","@type":"Person","name":"firewave"},"datePublished":"2025-08-04T11:59:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/477/simplecpp/issues/477"}