Had a "fun" hour or so debugging a C++ template instantiation link error (no compile error). Turned out to be a misplaced & in a prototype.

Diagnosed by comparing the linker error message (edited to give just the symbols) against the output of
objdump -t formula/formula.a.o | grep -v debug | grep -v ^AUX | grep -v data | grep -v text | grep -v constprop | sed s/.*\ // | sort | c++filt | grep "n<" | sort -V

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