Is there any way to have travis retry the build here? I think it was flaky.

This seems like a good idea. I just hope it doesn't change semantics for existing code (not counting cases that are not compiling).

Thanks!

I just found some semantics that could be changed by this.
But only for summation and products etc.
The comprehensions with a big symbol at the start, some math above and below it, and then some more math. Like sum_{i=1}^{n}i etc.

For those you will need the 'unsafe' version:

-- | Unsafe (in the first argument) Subscript.
(.!:) :: LaTeXC l => l -> l -> l
x .!: y = x <> raw "_" <> braces y

-- | Unsafe (in the first argument) Superscript.
(.^:) :: LaTeXC l => l -> l -> l
x .^: y = x <> raw "^"  <> braces y

-- * Comprehensions
compr :: Note -> Note -> Note -> Note -> Note
compr sign lower upper content = sign .!: lower .^: upper <> braces content

comp :: Note -> Note -> Note -> Note
comp sign lower content = braces (sign .!: braces lower) <> braces content

sum :: Note -> Note -> Note -> Note
sum = compr $ commS "sum"

I'm not sure where you used this in HaTeX because I've redefined it in my code.