Include column in syntax error message

[Karl-Philipp Richter]

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Hi,
Currently, syntax error messages like ``bash: syntax error near
unexpected token `;'``, e.g. after issuing `echo a &; echo b &; echo c
&;` aren't as helpful as they could be. It'd be nice to know at which
column, i.e. which `;`, the message refers to by adding the column to
the error message, e.g. ``bash: syntax error near unexpected token `;'
(col. y)``.

- -Kalle

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