Darcs has "replace" for that, the only other patch type that's been implemented for it as far as I know. I think Toolpack provided that for Fortran in the 1980

Darcs has "replace" for that, the only other patch type that's been implemented for it as far as I know. I think Toolpack provided that for Fortran in the 1980s, but I don't remember for sure whether its version control was AST-based latterly (and, of course, it wasn't networked, let alone distributed).