discard trailing blank comments

[rust.git] / src / closures.rs

diff --git a/src/closures.rs b/src/closures.rs
index 42b883589db1dd42ac03197fc6e816336b5cbd5a..1a4a6e44fdfba07db0177d3fffced668c5c977db 100644 (file)
--- a/src/closures.rs
+++ b/src/closures.rs
@@ -118,6 +118,22 @@ fn needs_block(block: &ast::Block, prefix: &str, context: &RewriteContext) -> bo
         || prefix.contains('\n')
 }
 
+fn veto_block(e: &ast::Expr) -> bool {
+    match e.node {
+        ast::ExprKind::Call(..)
+        | ast::ExprKind::Binary(..)
+        | ast::ExprKind::Cast(..)
+        | ast::ExprKind::Type(..)
+        | ast::ExprKind::Assign(..)
+        | ast::ExprKind::AssignOp(..)
+        | ast::ExprKind::Field(..)
+        | ast::ExprKind::Index(..)
+        | ast::ExprKind::Range(..)
+        | ast::ExprKind::Try(..) => true,
+        _ => false,
+    }
+}
+
 // Rewrite closure with a single expression wrapping its body with block.
 fn rewrite_closure_with_block(
     body: &ast::Expr,
@@ -126,7 +142,7 @@ fn rewrite_closure_with_block(
     shape: Shape,
 ) -> Option<String> {
     let left_most = left_most_sub_expr(body);
-    let veto_block = left_most != body && !classify::expr_requires_semi_to_be_stmt(left_most);
+    let veto_block = veto_block(body) && !classify::expr_requires_semi_to_be_stmt(left_most);
     if veto_block {
         return None;
     }
@@ -182,8 +198,7 @@ fn allow_multi_line(expr: &ast::Expr) -> bool {
             } else {
                 Some(rw)
             }
-        })
-        .map(|rw| format!("{} {}", prefix, rw))
+        }).map(|rw| format!("{} {}", prefix, rw))
 }
 
 // Rewrite closure whose body is block.
@@ -255,17 +270,9 @@ fn rewrite_closure_fn_decl(
         _ => arg_shape,
     };
 
-    let fmt = ListFormatting {
-        tactic,
-        separator: ",",
-        trailing_separator: SeparatorTactic::Never,
-        separator_place: SeparatorPlace::Back,
-        shape: arg_shape,
-        ends_with_newline: false,
-        preserve_newline: true,
-        nested: false,
-        config: context.config,
-    };
+    let fmt = ListFormatting::new(arg_shape, context.config)
+        .tactic(tactic)
+        .preserve_newline(true);
     let list_str = write_list(&item_vec, &fmt)?;
     let mut prefix = format!("{}{}{}|{}|", is_async, immovable, mover, list_str);
 
@@ -360,10 +367,8 @@ pub fn args_have_many_closure<T>(args: &[&T]) -> bool
                 .map(|e| match e.node {
                     ast::ExprKind::Closure(..) => true,
                     _ => false,
-                })
-                .unwrap_or(false)
-        })
-        .count()
+                }).unwrap_or(false)
+        }).count()
         > 1
 }