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I have noted a regression in make check starting from 263fdfe (found with bisect).
the failing test is one of doc-trpl-no-stdlib. The fail occurs with stage1 and with stage2 (it have help a lot for bisect: only 50 min for 1 step of bisect)
I extract the example to a standalone file, and manually run rustc: the error is a linking error:
original.o(.text._ZN6option15Option$LT$T$GT$8and_then21h10563965396030871015E+0xa0): In function `option::Option$LT$T$GT$::and_then::h10563965396030871015': undefined reference to `_Unwind_Resume'
it seems -lgcc isn't passed by rustc, whereas the symbol _Unwind_Resume was present in option::Option<T>::and_then.