pub enum TreatParams {
    AsPlaceholder,
    AsInfer,
}
Expand description

Generic parameters are pretty much just bound variables, e.g. the type of fn foo<'a, T>(x: &'a T) -> u32 { ... } can be thought of as for<'a, T> fn(&'a T) -> u32.

Typecheck of foo has to succeed for all possible generic arguments, so during typeck, we have to treat its generic parameters as if they were placeholders.

But when calling foo we only have to provide a specific generic argument. In that case the generic parameters are instantiated with inference variables. As we use simplify_type before that instantiation happens, we just treat generic parameters as if they were inference variables in that case.

Variants

AsPlaceholder

Treat parameters as placeholders in the given environment.

Note that this also causes us to treat projections as if they were placeholders. This is only correct if the given projection cannot be normalized in the current context. Even if normalization fails, it may still succeed later if the projection contains any inference variables.

AsInfer

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

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

This method tests for !=.

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: 1 byte

Size for each variant:

  • AsPlaceholder: 0 bytes
  • AsInfer: 0 bytes