pub enum NilSymbol {
EmptyList,
Default,
Special,
}
Expand description
Defines the treatment of the symbol nil
.
Parse nil
like as the empty list. This the behavior of Emacs
Lisp and Common Lisp.
In the parsed Value
, the empty list, written as ()
and the
empty list, written as nil
are both represented by the
Value::Null
variant.
Parse nil
as a regular symbol. This is the behavior found in
Scheme.
The parsed Value
will be equal to Value::symbol("nil")
.
Parse nil
as a special value. This allows treating the nil
symbol specially when processing the parsed data.
The parsed Value
will be equal to Value::Nil
.
Performs copy-assignment from
source
.
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Formats the value using the given formatter.
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This method tests for self
and other
values to be equal, and is used
by ==
.
This method tests for !=
. The default implementation is almost always
sufficient, and should not be overridden without very good reason.
Immutably borrows from an owned value.
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Mutably borrows from an owned value.
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Returns the argument unchanged.
Calls U::from(self)
.
That is, this conversion is whatever the implementation of
From<T> for U
chooses to do.
The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning.
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Uses borrowed data to replace owned data, usually by cloning.
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The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.