When syntax coloring is turned on, vim will (on my system, at least) flag invalid syntax with white text on a red background. OTOH, your example isn't what I would call a syntax error. By misspelling the variable name ($namw) in the second line, the third line appears to use an undeclared variable, which vim won't catch.

In reply to Re: On the fly syntax checkers in emacs, ultraedit or vi by samwyse
in thread On the fly syntax checkers in emacs, ultraedit or vi by ISAI student

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