swift-0001: QualifiedLookupRequest::evaluate (NameLookup.cpp:2860) pushes
protocol superclassDecl onto BFS stack unconditionally — visited.insert()
return not checked. Nearby ClassDecl arm (line 2833) is correctly guarded.
Diamond protocol hierarchies sharing a class superclass trigger O(2^D)
re-traversal on every qualified member lookup. Fix: check .second.
llvm, gcc, webkit: CLEAN in available sparse-clone code.
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com
Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.
