Enum TupleArgumentsFlag 

pub(crate) enum TupleArgumentsFlag {
    DontTupleArguments,
    TupleAllCallArgs,
    TupleSplattedSelfArg,
    TupleSplattedArg(u8),
}

Controls whether all arguments are tupled. This is used for the call operator only.

Tupling means that all call-side arguments are packed into a tuple and passed as a single parameter. For example, if tupling is enabled, this function:

fn f(x: (isize, isize)) {}

Can be called as:

f(1, 2);

Instead of:

f((1, 2));

Note: splatted arguments are handled separately.

Variants

DontTupleArguments

Arguments are typechecked unchanged.

TupleAllCallArgs

This is a call operator: all caller arguments are tupled before typechecking. Set based on the “rust-call” ABI and Fn* traits.

TupleSplattedSelfArg

The self method argument is splatted, so Self should be tupled before typechecking.

TupleSplattedArg(u8)

A non-self argument is splatted, so that argument should be tupled before typechecking.

Implementations

impl TupleArgumentsFlag

pub(crate) fn rust_fn_trait_call() -> Self

Returns the TupleArgumentsFlag for a known RustCall function.

pub(crate) fn with_fn_sig_kind<'tcx>( fn_sig_kind: FnSigKind<'tcx>, is_method: bool, ) -> Self

Returns the appropriate TupleArgumentsFlag for the given FnSigKind and method flag.

pub(crate) fn is_tupled(self) -> bool

Returns true if the arguments are tupled through “rust-call” or splatting.

pub(crate) fn is_splatted(self) -> bool

Returns true if the arguments are tupled through splatting. (But false if they are “rust-call” or not tupled.)

pub(crate) fn tupled_arg_index(self) -> (Option<usize>, bool)

Returns the tupled argument index, and whether the self argument is splatted. Returns None if the arguments are not tupled, or if the self argument is splatted.

Trait Implementations

impl Clone for TupleArgumentsFlag

fn clone(&self) -> TupleArgumentsFlag

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TupleArgumentsFlag

impl Debug for TupleArgumentsFlag

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

Formats the value using the given formatter.

impl Eq for TupleArgumentsFlag

impl PartialEq for TupleArgumentsFlag

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for TupleArgumentsFlag

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: 2 bytes

Size for each variant:

• DontTupleArguments: 0 bytes
• TupleAllCallArgs: 0 bytes
• TupleSplattedSelfArg: 0 bytes
• TupleSplattedArg: 1 byte