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Here's a C snippet that changes meaning:

struct foo
{
int a, b;
};

bar;
Here, bar is implicitely an int. If you omit the semicolon, bar is of type struct foo.

Basically, since whitespace doesn't really matter, what you're doing is the same as

while(...) {
}
;
You just have the loop, and then you have an empty statement.

Actually the fact that you...