bug in FF extension (yices_sum_component) to Yices API #506

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	10m 25s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	11m 30s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 37s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	5m 28s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 50s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 2s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 45s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 14s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 32s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 55s
	1h 7m 18s

Provide feedback