Details with bash's syntax checking and breaking over several lines

There are two cases in which I do not understand why bash behaves as it behaves regarding syntax checking and asking for a newline. # Case 1 bash can execute the line ( (ls) | cat), but depending on when you hit return while entering, it might work or not. This works:

( (ls ) |⏎
cat

This fails:

( (ls) ⏎
| cat)

with error >-bash: syntax error near unexpected token `|' Is there a logic why the second case is not working? Or it is just how bash works internally? # Case 2 Another thing I do not understand is, that, when you enter (ls) "⏎ bash asks for another line. Is there any way to finish this command without getting a syntax error? And if not, why does bash not directly print out an error message for a syntax error?