@Nonnull
	@VisibleForTesting
	MultiMap<String, MethodRef, Set<MethodRef>> getUnresolvedDeclarations() {
		return unresolvedDeclarations;
	}
@return Map of classes that could not be resolved, to method declarations observed being made to them.
recaf-core/src/main/java/software/coley/recaf/services/callgraph/CallGraph.java