Enum rustc_ast::ast::LitKind

source ·
pub enum LitKind {
    Str(SymbolStrStyle),
    ByteStr(Lrc<[u8]>),
    Byte(u8),
    Char(char),
    Int(u128LitIntType),
    Float(SymbolLitFloatType),
    Bool(bool),
    Err,
}
Expand description

This type is used within both ast::MetaItemLit and hir::Lit.

Note that the entire literal (including the suffix) is considered when deciding the LitKind. This means that float literals like 1f32 are classified by this type as Float. This is different to token::LitKind which does not consider the suffix.

Variants§

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Str(SymbolStrStyle)

A string literal ("foo"). The symbol is unescaped, and so may differ from the original token’s symbol.

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ByteStr(Lrc<[u8]>)

A byte string (b"foo").

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Byte(u8)

A byte char (b'f').

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Char(char)

A character literal ('a').

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Int(u128LitIntType)

An integer literal (1).

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Float(SymbolLitFloatType)

A float literal (1.0, 1f64 or 1E10f64). The pre-suffix part is stored as a symbol rather than f64 so that LitKind can impl Eq and Hash.

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Bool(bool)

A boolean literal (true, false).

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Err

Placeholder for a literal that wasn’t well-formed in some way.

Implementations§

Converts literal token into a semantic literal.

Attempts to recover a token from semantic literal. This function is used when the original token doesn’t exist (e.g. the literal is created by an AST-based macro) or unavailable (e.g. from HIR pretty-printing).

Returns true if this literal is a string.

Returns true if this literal is byte literal string.

Returns true if this is a numeric literal.

Returns true if this literal has no suffix. Note: this will return true for literals with prefixes such as raw strings and byte strings.

Returns true if this literal has a suffix.

Trait Implementations§

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Feeds this value into the given Hasher. Read more
Feeds a slice of this type into the given Hasher. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more

Auto Trait Implementations§

Blanket Implementations§

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

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. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
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.

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes

Size for each variant:

  • Str: 7 bytes
  • ByteStr: 23 bytes
  • Byte: 1 byte
  • Char: 7 bytes
  • Int: 23 bytes
  • Float: 7 bytes
  • Bool: 1 byte
  • Err: 0 bytes