Struct SourceReferences 

pub struct SourceReferences {
    pub paths: BTreeSet<String>,
    pub conservative: bool,
}

Paths one file’s executable expressions mention, and how much the scan could actually see. 一个文件的可执行表达式提到的路径，以及这次扫描实际能看到多少。

A caller that prunes faces from this list must respect conservative: the scan is lexical, so anything it cannot follow has to widen the result instead of silently shrinking it. 依据这份清单裁剪注册面的调用方必须尊重 conservative：扫描是词法层面的，凡它跟不下去 的东西都必须让结果变宽，而不是悄悄变窄。

Fields

paths: BTreeSet<String>

Every path reached through an expression, with imports excluded. 经表达式触达的每个路径，不含导入。

conservative: bool

Set when the scan met something it cannot follow (macro expansion, a trait object, include!), so the caller must not prune on this list alone. 扫描遇到跟不下去的东西（宏展开、trait object、include!）时置位，调用方不得仅凭 这份清单裁剪。

Trait Implementations

impl Clone for SourceReferences

fn clone(&self) -> SourceReferences

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SourceReferences

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

Formats the value using the given formatter.

impl Default for SourceReferences

fn default() -> SourceReferences

Returns the “default value” for a type.

impl Eq for SourceReferences

impl PartialEq for SourceReferences

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SourceReferences