Enforce a blank line after local function declarations.

test/whitespace/blocks.stmt

 40 columns                              |
 >>> require at least one newline between statements
 {a();b();c();}
 <<<
 {
   a();
   b();
   c();
 }
 >>> allow an extra newline between statements
@@ skipping 36 matching lines @@
 }
 >>> dartbug.com/16810
 {
   var a;;;
 }
 <<<
 {
   var a;
   ;
   ;
+}
+>>> force blank line after non-empty local function
+{
+  a() {;}
+  b();
+
+
+  c() {;}d(){;}
+
+
+}
+<<<
+{
+  a() {
+    ;
+  }
+
+  b();
+
+  c() {
+    ;
+  }
+
+  d() {
+    ;
+  }
+}
+>>> do not force blank line after empty local function
+{ a() {} b() {} }
+<<<
+{
+  a() {}
+  b() {}
+}
+>>> do not force blank line after => body local function
+{ a() => null; b() => null; }
+<<<
+{
+  a() => null;
+  b() => null;
 }