use tabs to position error message cursor when appropriate #1414
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On error, stanc prints the problematic source line and a caret that points to the horizontal location of the error but if the source line contains tabs instead of spaces the caret was at the wrong location.
A simple fix is to duplicate the tabs from the source to the line that contains the caret.
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Copyright holder: Niko Huurre
By submitting this pull request, the copyright holder is agreeing to
license the submitted work under the BSD 3-clause license (https://opensource.org/licenses/BSD-3-Clause)