: try-eliminate-copy ( follower leader must? -- )
-rot leaders 2dup = [ 3drop ] [
2dup vregs-interfere? [
- drop rot [ vregs-shouldn't-interfere ] [ 2drop ] if
+ drop rot [ throw-vregs-shouldn't-interfere ] [ 2drop ] if
] [ -rot coalesce-vregs drop ] if
] if ;