end expressions like return/continue/break with a semicolon

Close rust-lang#3213

Author: scampi

src/config/license.rs

@@ -137,7 +137,7 @@ impl TemplateParser {
                 return Err(LicenseError::Parse(format!(
                     "incomplete escape sequence on l. {}",
                     parser.linum
-                )))
+                )));
             }
             _ => (),
         }

src/matches.rs

@@ -29,7 +29,7 @@ use source_map::SpanUtils;
 use spanned::Spanned;
 use utils::{
     contains_skip, extra_offset, first_line_width, inner_attributes, last_line_extendable, mk_sp,
-    ptr_vec_to_ref_vec, trimmed_last_line_width,
+    ptr_vec_to_ref_vec, semicolon_for_expr, trimmed_last_line_width,
 };
 
 /// A simple wrapper type against `ast::Arm`. Used inside `write_list()`.
@@ -413,7 +413,12 @@ fn rewrite_match_body(
             } else {
                 ""
             };
-            ("{", format!("{}}}{}", indent_str, comma))
+            let semicolon = if semicolon_for_expr(context, body) {
+                ";"
+            } else {
+                ""
+            };
+            ("{", format!("{}{}}}{}", semicolon, indent_str, comma))
         } else {
             ("", String::from(","))
         };

tests/source/issue-3213.rs

@@ -0,0 +1,7 @@
+fn foo() {
+    match 0 {
+        0 => return AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA,
+        1 => AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA,
+        _ => "",
+    };
+}

tests/source/match.rs

@@ -545,7 +545,7 @@ fn issue_3005() {
                  {
                      return NoCalcLength::parse_dimension(context, value, unit)
                          .map(LengthOrPercentage::Length)
-                         .map_err(|()| location.new_unexpected_token_error(token.clone()))
+                         .map_err(|()| location.new_unexpected_token_error(token.clone()));
                  },
              }
 }

tests/target/issue-3213.rs

@@ -0,0 +1,11 @@
+fn foo() {
+    match 0 {
+        0 => {
+            return AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA;
+        }
+        1 => {
+            AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
+        }
+        _ => "",
+    };
+}

tests/target/match.rs

@@ -572,7 +572,7 @@ fn issue_3005() {
         } if num_context.is_ok(context.parsing_mode, value) => {
             return NoCalcLength::parse_dimension(context, value, unit)
                 .map(LengthOrPercentage::Length)
-                .map_err(|()| location.new_unexpected_token_error(token.clone()))
+                .map_err(|()| location.new_unexpected_token_error(token.clone()));
         }
     }
 }