no error -w3 when use function

PROCEDURE Main
   LOCAL A
   A := 'X'
   A += 'X' + hb_Eol()
   RETURN

PROCEDURE Main
   LOCAL A
   A := 'X'
   A += 'X'
   RETURN

On first sample, no error compiling with -w3
On second sample ok, 
test.prg:9: warning W0032  Variable 'A' is assigned but not used in function '6:MAIN'