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minor additions to the manual

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Araq 2014-03-10 08:46:41 +01:00
commit d4714ed14e
1 changed files with 17 additions and 4 deletions
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21
doc/manual.txt
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@ -79,8 +79,21 @@ program execution. Unless explicitly classified, an error is a static error.
A `checked runtime error`:idx: is an error that the implementation detects A `checked runtime error`:idx: is an error that the implementation detects
and reports at runtime. The method for reporting such errors is via *raising and reports at runtime. The method for reporting such errors is via *raising
exceptions*. However, the implementation provides a means to disable these exceptions* or *dying with a fatal error*. However, the implementation
runtime checks. See the section pragmas_ for details. provides a means to disable these runtime checks. See the section pragmas_
for details.
Wether a checked runtime error results in an exception or in a fatal error at
runtime is implementation specific. Thus the following program is always
invalid:
.. code-block:: nimrod
var a: array[0..1, char]
let i = 5
try:
a[i] = 'N'
except EInvalidIndex:
echo "invalid index"
An `unchecked runtime error`:idx: is an error that is not guaranteed to be An `unchecked runtime error`:idx: is an error that is not guaranteed to be
detected, and can cause the subsequent behavior of the computation to detected, and can cause the subsequent behavior of the computation to
@ -522,7 +535,7 @@ Strong spaces
The number of spaces preceeding a non-keyword operator affects precedence The number of spaces preceeding a non-keyword operator affects precedence
if the experimental parser directive ``#!strongSpaces`` is used. Indentation if the experimental parser directive ``#!strongSpaces`` is used. Indentation
is not used to determine the number of spaces. If 2 or more operators have the is not used to determine the number of spaces. If 2 or more operators have the
same number of preceeding spaces the precedence table applies, so ``1 + 3 * 4`` same number of preceding spaces the precedence table applies, so ``1 + 3 * 4``
is still parsed as ``1 + (3 * 4)``, but ``1+3 * 4`` is parsed as ``(1+3) * 4``: is still parsed as ``1 + (3 * 4)``, but ``1+3 * 4`` is parsed as ``(1+3) * 4``:
.. code-block:: nimrod .. code-block:: nimrod
@ -3481,7 +3494,7 @@ Declarative type classes are written in the following form:
c.len is ordinal c.len is ordinal
items(c) is iterator items(c) is iterator
for value in c: for value in c:
value.type is T type(value) is T
The type class will be matched if: The type class will be matched if: