fix(rustfmt): fix struct field formatting with doc comments present (rust-lang#5217)

* fix(rustfmt): fix struct field formatting with doc comments present

Fixes rust-lang#5215

* fix review feedbacks

* add unit test without doc comment

* move tests to a seperate file

* add additional test cases

* reintroduce a newline at the of test/souce/structs.rs

Author: tharun208

Diff for: src/items.rs

@@ -1771,7 +1771,7 @@ pub(crate) fn rewrite_struct_field(
         .offset_left(overhead + spacing.len())
         .and_then(|ty_shape| field.ty.rewrite(context, ty_shape));
     if let Some(ref ty) = orig_ty {
-        if !ty.contains('\n') {
+        if !ty.contains('\n') && !contains_comment(context.snippet(missing_span)) {
             return Some(attr_prefix + &spacing + ty);
         }
     }

Diff for: tests/source/struct_field_doc_comment.rs

@@ -0,0 +1,72 @@
+// #5215
+struct MyTuple(
+    /// Doc Comments
+    /* TODO note to add more to Doc Comments */ u32,
+    /// Doc Comments
+    // TODO note
+    u64,
+);
+
+struct MyTuple(
+    #[cfg(unix)] // some comment
+    u64,
+    #[cfg(not(unix))] /*block comment */
+    u32,
+);
+
+struct MyTuple(
+    #[cfg(unix)]
+    // some comment
+    u64,
+    #[cfg(not(unix))]
+    /*block comment */
+    u32,
+);
+
+struct MyTuple(
+    #[cfg(unix)] // some comment
+    pub u64,
+    #[cfg(not(unix))] /*block comment */
+    pub(crate) u32,
+);
+
+struct MyTuple(
+    /// Doc Comments
+    /* TODO note to add more to Doc Comments */
+    pub u32,
+    /// Doc Comments
+    // TODO note
+    pub(crate) u64,
+);
+
+struct MyStruct {
+    #[cfg(unix)] // some comment
+    a: u64,
+    #[cfg(not(unix))] /*block comment */
+    b: u32,
+}
+
+struct MyStruct {
+    #[cfg(unix)] // some comment
+    pub a: u64,
+    #[cfg(not(unix))] /*block comment */
+    pub(crate) b: u32,
+}
+
+struct MyStruct {
+    /// Doc Comments
+    /* TODO note to add more to Doc Comments */
+    a: u32,
+    /// Doc Comments
+    // TODO note
+    b: u64,
+}
+
+struct MyStruct {
+    /// Doc Comments
+    /* TODO note to add more to Doc Comments */
+    pub a: u32,
+    /// Doc Comments
+    // TODO note
+    pub(crate) b: u64,
+}

Diff for: tests/target/struct_field_doc_comment.rs

@@ -0,0 +1,69 @@
+// #5215
+struct MyTuple(
+    /// Doc Comments
+    /* TODO note to add more to Doc Comments */
+    u32,
+    /// Doc Comments
+    // TODO note
+    u64,
+);
+
+struct MyTuple(
+    #[cfg(unix)] // some comment
+    u64,
+    #[cfg(not(unix))] /*block comment */ u32,
+);
+
+struct MyTuple(
+    #[cfg(unix)]
+    // some comment
+    u64,
+    #[cfg(not(unix))]
+    /*block comment */
+    u32,
+);
+
+struct MyTuple(
+    #[cfg(unix)] // some comment
+    pub  u64,
+    #[cfg(not(unix))] /*block comment */ pub(crate)  u32,
+);
+
+struct MyTuple(
+    /// Doc Comments
+    /* TODO note to add more to Doc Comments */
+    pub  u32,
+    /// Doc Comments
+    // TODO note
+    pub(crate)  u64,
+);
+
+struct MyStruct {
+    #[cfg(unix)] // some comment
+    a: u64,
+    #[cfg(not(unix))] /*block comment */ b: u32,
+}
+
+struct MyStruct {
+    #[cfg(unix)] // some comment
+    pub a: u64,
+    #[cfg(not(unix))] /*block comment */ pub(crate) b: u32,
+}
+
+struct MyStruct {
+    /// Doc Comments
+    /* TODO note to add more to Doc Comments */
+    a: u32,
+    /// Doc Comments
+    // TODO note
+    b: u64,
+}
+
+struct MyStruct {
+    /// Doc Comments
+    /* TODO note to add more to Doc Comments */
+    pub a: u32,
+    /// Doc Comments
+    // TODO note
+    pub(crate) b: u64,
+}