714a082a5d Minimal integration of summary2 into AnalysisDriver.
dd3530450d make "late" and "required" builtin keywords
836efd6520 Add a language_2 test for having an invalid type in an on clause
81e554ea43 parse "required" modifier for NNBD
1eab04ed3f Reland "[VM-debugger] resolve column breakpoint tokenposition into a single value"
ec27b09e68 [vm, service] Fix deferral of service extension invocation to not be mislead by other OOB messages.
1e30bb90dc [vm/dbc] Support unboxed Int64 on DBC