It seems that the hyperindexformat in haskell.ind is generated. If I edit
the file as you wrote and do make clean && make, the file is modified back
to using \".
On 2 July 2014 18:46, Richard A. O'Keefe
On 3/07/2014, at 8:14 AM, Christopher Done wrote:
(./haskell.ind (./index-intro.tex) ! Argument of \OT1\" has an extra }. <inserted text> \par l.61 \item |hyperindexformat{\"} , 51, 73, 107, 112 ?
Does anyone familiar with the language of LaTeX have any idea what's going on?
The \" command in TeX says "You see the next item? Put a diaeresis over it." So it is expecting a plain character, or possibly a command naming a character. But } is an "active" character with a special meaning.
The most likely explanation here is that \" should *really* be \textquotedbl. Apparently someone thought \" in TeX was like \" in a C string, but it never has been.
If you can change that line from \item |hyperindexformat{\"}.... to \item |hyperindexformat{\textquotdbl}.... the problem *might* go away.