-Z dlltool=val -- import library generation tool (windows-gnu only)
-Z dont-buffer-diagnostics=val -- emit diagnostics rather than buffering (breaks NLL error downgrading, sorting) (default: no)
-Z drop-tracking=val -- enables drop tracking in generators (default: no)
+ -Z drop-tracking-mir=val -- enables drop tracking on MIR in generators (default: no)
-Z dual-proc-macros=val -- load proc macros for both target and host, but only link to the target (default: no)
-Z dump-dep-graph=val -- dump the dependency graph to $RUST_DEP_GRAPH (default: /tmp/dep_graph.gv) (default: no)
-Z dump-drop-tracking-cfg=val -- dump drop-tracking control-flow graph as a `.dot` file (default: no)