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parser: resolve ambiguity where both prefix and primary actions are defined

If both actions are defined, a primary-expression action is accepted only if
the next token never starts new term. For example,

  parsed as primary expression:
  ":"   # next token 'end' has no action
  "(:)" # next token ')' has no action
  ":+y" # next token '+' is infix operator

  parsed as prefix operator:
  ":y"  # next token 'y' is primary expression
  ":-y" # next token '-' is prefix operator

This is mostly the same resolution as the infix/suffix rules.

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