> was an actual mistake by the C89 committee Agreed. Apparently the first compiler written by Dennis Ritchie had no UB (i have not been able to find more info.

> was an actual mistake by the C89 committee Agreed. Apparently the first compiler written by Dennis Ritchie had no UB (i have not been able to find more info. on this). See also the article published in IEEE : Dealing With C's Original Sin by Chris Hathhorn and Grigore Rosu.