Rollup of 6 pull requests#75016

Merged

bors merged 12 commits intorust-lang:masterfrom

Manishearth:rollup-x553g7j

Aug 1, 2020

Commits on Aug 1, 2020

Replace a recursive algorithm with an iterative one and a stack.
oli-obk
committed
Clean up E0743 explanation
GuillaumeGomez
committed
Rollup merge of #74977 - GuillaumeGomez:cleanup-e0741, r=pickfire
Manishearth
authored
Rollup merge of #74981 - giraffate:fix_sample_codes_in_unstable_book_plugin, r=GuilliameGomez
Manishearth
authored
Rollup merge of #74983 - oli-obk:mir_opt_goto_chain, r=ecstatic-morse
Manishearth
authored
Rollup merge of #74995 - sunfishcode:update-llvm, r=alexcrichton
Manishearth
authored
Rollup merge of #74996 - matthiaskrgr:submodule_upd, r=ehuss
Manishearth
authored
Rollup merge of #75007 - GuillaumeGomez:cleanup-e0743, r=pickfire
Manishearth
authored