pub struct StableSourceFileId {
    pub file_name_hash: u64,
    pub cnum: CrateNum,
}
Expand description

This is a SourceFile identifier that is used to correlate source files between subsequent compilation sessions (which is something we need to do during incremental compilation).

The StableSourceFileId also contains the CrateNum of the crate the source file was originally parsed for. This way we get two separate entries in the SourceMap if the same file is part of both the local and an upstream crate. Trying to only have one entry for both cases is problematic because at the point where we discover that there’s a local use of the file in addition to the upstream one, we might already have made decisions based on the assumption that it’s an upstream file. Treating the two files as different has no real downsides.

Fields

file_name_hash: u64cnum: CrateNum

Implementations

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: 16 bytes