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Summary: Using a BreakpointList corrupts the breakpoints' IDs because BreakpointList::Add sets the ID, so use a vector instead, and update the signature to return the vector wrapped in an llvm::Expected which can propagate any error from the inner call to StringIsBreakpointName. Note that, despite the similar name, SBTarget::FindBreakpointsByName doesn't suffer the same problem, because it uses a SBBreakpointList, which is more like a BreakpointIDList than a BreakpointList under the covers. Add a check to TestBreakpointNames that, without this fix, notices the ID getting mutated and fails. Reviewers: jingham, JDevlieghere Reviewed By: JDevlieghere Subscribers: lldb-commits Tags: #lldb Differential Revision: https://reviews.llvm.org/D70907