> Back in 89 […] `restrict` was actually a keyword. Was it? I thought it’s more recent. https://en.wikipedia.org/wiki/Restrict https://en.wikipedia.org/wiki/Re

> Back in 89 […] `restrict` was actually a keyword. Was it? I thought it’s more recent. https://en.wikipedia.org/wiki/Restrict https://en.wikipedia.org/wiki/Restrict seems to agree (“In the C programming language, restrict is a keyword, introduced by the C99 standard,[1] that can be used in pointer declarations”), as does https://en.cppreference.com/w/c/language/restrict https://en.cppreference.com/w/c/language/restrict (“restrict type qualifier (since C99)”) Was there an older usage?