I have an ocamlyacc grammar that contains productions that look like:

foo_list: FOO { [$1] }
  | foo_list COMMA FOO { $3 :: $1 }
  ;

which creates a list of FOO objects.  I however have some rules that
need to be prefixed by either a single FOO or a foo_list, like so:

bar: foo_list COLON xyzzy { ... }

and

baz: FOO COLON yzzyx { ... }

This of course produces a shift/reduce conflict, and shifting fails to
parse the 'bar' correctly.  Perhaps I need to read a compiler
construction textbook more thoroughly to figure out this answer, but any
hints out there on getting rid of this shift/reduce.

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