Enum lexpr::parse::NilSymbol

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pub enum NilSymbol {
    EmptyList,
    Default,
    Special,
}

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Defines the treatment of the symbol nil.

Variants

EmptyList

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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.

Default

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Parse nil as a regular symbol. This is the behavior found in Scheme.

The parsed Value will be equal to Value::symbol("nil").

Special

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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.

Trait Implementations

impl Clone for NilSymbol[+]

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fn clone(&self) -> NilSymbol[−]

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)[−]

Performs copy-assignment from source.

impl Copy for NilSymbol

impl Debug for NilSymbol[+]

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fn fmt(&self, f: &mut Formatter) -> Result[−]

Formats the value using the given formatter.

impl PartialEq<NilSymbol> for NilSymbol[+]

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fn eq(&self, other: &NilSymbol) -> bool[−]

This method tests for self and other values to be equal, and is used by ==.

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#[must_use]fn ne(&self, other: &Rhs) -> bool[−]

This method tests for !=.

impl StructuralPartialEq for NilSymbol