Question? passing visual selection to function

Question? passing visual selection to function

The function BlkInc() puts line numbers at the start of line.

EXAMPLE 1 works
EXAMPLE 2 does not work

Can you explain why?

""-----=-------=-------=-------=-------=-------=-------=-------=
" EXAMPLE 1
function! BlkNum()
'<,'>s/^/\=BlkInc()/
endfun
vmap <F5> :<C-U>call BlkNum()<cr>

""-----=-------=-------=-------=-------=-------=-------=-------=
" EXAMPLE 2
function! BlkNum()
s/^/\=BlkInc()/
endfun
vmap <F5> :call BlkNum()<cr>

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