line.startsWith("DEFAULT_JVM_OPTS='") && line.endsWith('\'') -> {
                    ++replacementsCount
                    // Use shell's string concatenation: '...'"..." glues contents of quoted and double-quoted strings together.
                    // The result would be something like DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'" \"-javaagent:$APP_HOME/lib/agents/foobar.jar\""

            // So, for now, just blame the first user code that can be identified. This gives the user some clues for where to start
            startPos = 0;
            endPos = stack.size();
        } else {
            // When analysing a problem stack trace, consider only the deepest user code in the stack.

			certain[b.ID] = blEXIT

			// Ret, it depends.
		case BlockRet, BlockRetJmp:
			local[b.ID] = blRET
			certain[b.ID] = blRET

			// Calls. TODO not all calls are equal, names give useful clues.
			// Any name-based heuristics are only relative to other calls,
			// and less influential than inferences from loop structure.
		case BlockDefer:
			local[b.ID] = blCALL