Adjust how TrailingSemicolon lints List and Map variable definitions

lib/scss_lint/linter/trailing_semicolon.rb

@@ -15,6 +15,16 @@ def visit_variable(node)
       # !default`.
       return check_semicolon(node) if node.global || node.guarded
 
+      # If the variable is a multi-line ListLiteral or MapLiteral, then
+      # `node.expr` will give us everything except the last right paren, and
+      # the semicolon if it exists. In these cases, use the source range of
+      # `node` as above.
+      if (node.expr.is_a?(Sass::Script::Tree::ListLiteral) ||
+          node.expr.is_a?(Sass::Script::Tree::MapLiteral)) &&
+         !node_on_single_line?(node)
+        return check_semicolon(node)
+      end
+
       check_semicolon(node.expr)
     end
 

spec/scss_lint/linter/trailing_semicolon_spec.rb

@@ -470,6 +470,34 @@
         it { should report_lint }
       end
     end
+
+    context 'and a nested list' do
+      context 'and ends with a semicolon' do
+        let(:scss) { <<-SCSS }
+          $foo: (
+            "a": (
+              "b",
+              "c"
+            )
+          );
+        SCSS
+
+        it { should_not report_lint }
+      end
+
+      context 'and is missing a semicolon' do
+        let(:scss) { <<-SCSS }
+          $foo: (
+            "a": (
+              "b",
+              "c"
+            )
+          )
+        SCSS
+
+        it { should report_lint }
+      end
+    end
   end
 
   context 'with an @extend directive' do