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Add examples to TyKind::FnDef and TyKind::FnPtr docs #54781

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@@ -126,10 +126,25 @@ pub enum TyKind<'tcx> {
Ref(Region<'tcx>, Ty<'tcx>, hir::Mutability),

/// The anonymous type of a function declaration/definition. Each
/// function has a unique type.
/// function has a unique type, which is output (for a function
/// named `foo` returning an `i32`) as `fn() -> i32 {foo}`.
///
/// For example the type of `bar` here:
///
/// ```rust
/// fn foo() -> i32 { 1 }
/// let bar = foo; // bar: fn() -> i32 {foo}
/// ```
FnDef(DefId, &'tcx Substs<'tcx>),

/// A pointer to a function. Written as `fn() -> i32`.
///
/// For example the type of `bar` here:
///
/// ```rust
/// fn foo() -> i32 { 1 }
/// let bar: fn() -> i32 = foo;
/// ```
FnPtr(PolyFnSig<'tcx>),

/// A trait, defined with `trait`.