rhs_uds `plusUDs` plusUDList spec_uds)
| otherwise -- No calls or RHS doesn't fit our preconceptions
- = WARN( notNull calls_for_me, ptext SLIT("Missed specialisation opportunity for") <+> ppr fn )
+ = WARN( notNull calls_for_me, ptext (sLit "Missed specialisation opportunity for") <+> ppr fn )
-- Note [Specialisation shape]
(do { (rhs', rhs_uds) <- specExpr subst rhs
; return ((fn, rhs'), [], rhs_uds) })