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follow #8463 #14157 and document cstring literals modification is not allowed #15878

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Nov 12, 2020
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follow #8463 #14157 and document cstring literals modification is not allowed #15878

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follow #8463 #14157 and document cstring literals
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Thanks for timotheecour's advice
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14 changes: 14 additions & 0 deletions doc/manual.rst
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Expand Up @@ -1282,6 +1282,20 @@ string from a cstring:
var cstr: cstring = str
var newstr: string = $cstr

``cstring`` literals shouldn't be modified.

.. code-block:: nim
var x = cstring"literals"
x[1] = 'A' # This is wrong!!!

If the ``cstring`` originates from a regular memory (not read-only memory),
it can be modified:

.. code-block:: nim
var x = "123456"
var s: cstring = x
s[0] = 'u' # This is ok

Structured types
----------------
A variable of a structured type can hold multiple values at the same
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