mod-assign: first=1.
mod-assign: last=3.
mod-assign: appended=1 2 3.
1
2
3
mod-assign: ran:3.
mod-assign: global: 1, 3, 1 2 3, 3.
mod-assign-nested: then1t1
mod-assign-nested: else2e2
mod-assign-nested: then3t3
mod-assign-nested: else4e4
make: Bad modifier `:' for 
mod-assign-empty: value}
make: Bad modifier `:' for 
mod-assign-empty: overwritten}
mod-assign-empty: VAR=overwritten
make: Unknown modifier ':'

sysv:y
make: Unfinished modifier for ASSIGN ('}' missing)

ok=word
make: " echo word; false " returned non-zero status
err=previous
exit status 0