Tests
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Now tex on the following line, valid fot tex (with @end tex on a line).
 some

tex \TeX 

Same that @html (but empty following line not ignored).

Test of @math
Here some {x^i}\over{\tan y}.

Maths with protected \:
a \ b.

Maths with code @-command:

math code a < b

Maths with code @-command and braces:

 \underline{math \hbox{ code }} \sum_{i}{\underline{f}}

@\ outside of math

@\

