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[spec] Clarify that strings can separate tokens #1490

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[spec] Clarify that strings can separate tokens #1490

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3 changes: 2 additions & 1 deletion document/core/text/lexical.rst
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Expand Up @@ -63,7 +63,8 @@ The set of *keyword* tokens is defined implicitly, by all occurrences of a :ref:
Any token that does not fall into any of the other categories is considered *reserved*, and cannot occur in source text.

.. note::
The effect of defining the set of reserved tokens is that all tokens must be separated by either parentheses or :ref:`white space <text-space>`.
The effect of defining the set of reserved tokens is that all tokens must be separated by either parentheses,
:ref:`white space <text-space>`, or :ref:`string <text-string>` literals.
For example, :math:`\text{0\$x}` is a single reserved token.
Consequently, it is not recognized as two separate tokens :math:`\text{0}` and :math:`\text{\$x}`, but instead disallowed.
This property of tokenization is not affected by the fact that the definition of reserved tokens overlaps with other token classes.
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