I've tried to look into the code to find the source of this behavior,
but eventually decided that trying to understand what it does would
take me too much time so I gave up.
I had a quick look, too, and haven't spotted the bug yet.
Note that your second example is a red herring:
<a[a<a>a]a>
is highlighted correctly. :syn match rules cannot nest (or overlap), so
the brackets correctly extend the match that originally spanned
characters 1-7 to span characters 1-9.
Your other two examples demonstrate the strange behaviour. Here's an
even simpler case:
sy clear
sy region braces
\ matchgroup=Type start=/{/ end=/}/
\ contains=parens keepend
sy region parens
\ matchgroup=Statement start=/(/ end=/)/
\ contains=parens extend
hi link braces Comment
hi link parens PreProc
finish
{a(a(a(a)a)a)a}
I just have it in a single file and use :sou % to (re)load it.
Ben.
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