fixed assignment to block expression from an expression with nonzero … #1132

Job	Run time
macos-latest: clang++ Release Pthreads	14m 5s
macos-latest: clang++ Release PaRSEC	14m 6s
macos-latest: clang++ Debug Pthreads	13m 16s
macos-latest: clang++ Debug PaRSEC	13m 5s
macos-latest: /opt/homebrew/bin/g++-11 Release Pthreads	20m 6s
macos-latest: /opt/homebrew/bin/g++-11 Release PaRSEC	21m 5s
macos-latest: /opt/homebrew/bin/g++-11 Debug Pthreads	19m 51s
macos-latest: /opt/homebrew/bin/g++-11 Debug PaRSEC	18m 10s
	2h 13m 44s

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