Struct Options 

#[non_exhaustive]
pub struct Options {
    pub trigraphs: bool,
    pub line_comments: bool,
    pub digit_separators: bool,
}

The dialect knobs phase 1 cares about.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

trigraphs: bool

Replace trigraphs, which -trigraphs turns on.

Off by default because C23 removed them, and because leaving them on means ??! inside a string literal silently becomes |, which has caught out every project that ever wrote a question mark next to a punctuator.

line_comments: bool

Whether // starts a comment, which C99 took from C++ and which gcc offers in gnu89 as an extension. Off means the two slashes are two punctuators, which is what -std=c89 says and is a syntax error wherever a real line comment was written.

digit_separators: bool

Whether ' between digits is part of the number, which is C23 and is not a GNU extension. Off means 1'000'000 is a number, a multi-character character constant and another number, which is how gcc reads it before C23 and why it does not parse.

Implementations

impl Options

pub fn new() -> Options

The defaults, which are what -std=gnu23 implies.

pub fn for_dialect(std: Std, gnu: bool) -> Options

What a dialect implies, which is the form the driver wants.

Trait Implementations

impl Clone for Options

fn clone(&self) -> Options

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Options

impl Debug for Options

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Options

fn default() -> Options

Returns the “default value” for a type.

impl Eq for Options

impl PartialEq for Options

fn eq(&self, other: &Options) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Options