Rewrite paths ending in ::self to ::{self}.

Author: msmorgan

src/formatting/imports.rs

@@ -179,6 +179,16 @@ pub(crate) fn merge_use_trees(use_trees: Vec<UseTree>, merge_by: SharedPrefix) -
             }
         }
     }
+    for merged in result.iter_mut() {
+        // If a path ends with `::self`, rewrite it to `::{self}`.
+        if let Some(UseSegment::Slf(..)) = merged.path.last_mut() {
+            let slf_segment = merged.path.pop().unwrap();
+            merged.path.push(UseSegment::List(vec![UseTree::from_path(
+                vec![slf_segment],
+                DUMMY_SP,
+            )]));
+        }
+    }
     result
 }
 
@@ -550,11 +560,6 @@ impl UseTree {
     fn flatten(self) -> Vec<UseTree> {
         match self.path.last() {
             Some(UseSegment::List(list)) => {
-                if list.len() == 1 && list[0].path.len() == 1 {
-                    if let UseSegment::Slf(..) = list[0].path[0] {
-                        return vec![self];
-                    };
-                }
                 let prefix = &self.path[..self.path.len() - 1];
                 let mut result = vec![];
                 for nested_use_tree in list {
@@ -1086,7 +1091,7 @@ mod test {
         test_merge!(
             NoPrefix,
             ["foo::{self, a, b::{c, d}, e::*}"],
-            ["foo::self", "foo::a", "foo::b::c", "foo::b::d", "foo::e::*"]
+            ["foo::{self}", "foo::a", "foo::b::c", "foo::b::d", "foo::e::*"]
         )
     }
 

src/formatting/reorder.rs

@@ -238,11 +238,6 @@ fn rewrite_reorderable_or_regroupable_items(
                 }
                 ImportGranularity::Preserve => normalized_items,
             };
-            for item in normalized_items.iter_mut() {
-                if let Some(UseSegment::Slf(None)) = item.path.last() {
-                    item.path.pop().unwrap();
-                }
-            }
 
             let mut regrouped_items = match context.config.group_imports() {
                 GroupImportsTactic::Preserve => vec![normalized_items],

tests/target/imports_granularity_item.rs

@@ -6,8 +6,8 @@ use a::d;
 use a::f::g;
 use a::h::i;
 use a::h::j;
-use a::l;
 use a::l::m;
 use a::l::n::o;
 use a::l::p::*;
+use a::l::{self};
 use a::q::{self};