Comply exhaustive case check

src/ameba/ast/flow_expression.cr

@@ -59,6 +59,8 @@ module Ameba::AST
         end
       when Crystal::BinaryOp
         unreachable_nodes << current_node.right if flow_expression?(current_node.left, in_loop?)
+      else
+        # nop
       end
 
       unreachable_nodes

src/ameba/ast/util.cr

@@ -147,6 +147,8 @@ module Ameba::AST::Util
       true
     when Crystal::Call
       node.name == "loop" && node.args.size == 0 && node.obj.nil?
+    else
+      false
     end
   end
 end

src/ameba/ast/visitors/redundant_control_expression_visitor.cr

@@ -28,6 +28,8 @@ module Ameba::AST
       when Crystal::Case                then traverse_case node
       when Crystal::BinaryOp            then traverse_binary_op node
       when Crystal::ExceptionHandler    then traverse_exception_handler node
+      else
+        # ok
       end
     end
 

src/ameba/ast/visitors/scope_visitor.cr

@@ -161,19 +161,21 @@ module Ameba::AST
 
     # :nodoc:
     def visit(node : Crystal::Call)
-      case @current_scope
-      when .def?
+      case
+      when @current_scope.def?
         if node.name == SUPER_NODE_NAME && node.args.empty?
           @current_scope.arguments.each do |arg|
             variable = arg.variable
             variable.reference(variable.node, @current_scope).explicit = false
           end
         end
-      when .top_level?
-        return false if record_macro?(node)
-      end
 
-      true
+        true
+      when @current_scope.top_level? && record_macro?(node)
+        false
+      else
+        true
+      end
     end
 
     private def record_macro?(node)

src/ameba/rule/lint/percent_array.cr

@@ -49,6 +49,8 @@ module Ameba::Rule::Lint
             issue_for start_token.not_nil!, issue.not_nil!
           end
           issue = start_token = nil
+        else
+          # nop
         end
       end
     end
@@ -59,6 +61,8 @@ module Ameba::Rule::Lint
         check_array_entry entry, string_array_unwanted_symbols, "%w"
       when .starts_with? "%i"
         check_array_entry entry, symbol_array_unwanted_symbols, "%i"
+      else
+        # nop
       end
     end
 

src/ameba/rule/lint/redundant_with_index.cr

@@ -42,6 +42,8 @@ module Ameba::Rule::Lint
         report source, node, "Remove redundant with_index"
       when "each_with_index"
         report source, node, "Use each instead of each_with_index"
+      else
+        # nop
       end
     end
 

src/ameba/rule/style/redundant_begin.cr

@@ -76,6 +76,8 @@ module Ameba::Rule::Style
         redundant_begin_in_handler?(source, body, node)
       when Crystal::Expressions
         redundant_begin_in_expressions?(body)
+      else
+        # nop
       end
     end
 

src/ameba/tokenizer.cr

@@ -68,6 +68,8 @@ module Ameba
           break
         when :"}"
           break if break_on_rcurly
+        else
+          # go on
         end
       end
     end
@@ -84,6 +86,8 @@ module Ameba
           run_normal_state lexer, break_on_rcurly: true, &block
         when :EOF
           break
+        else
+          # go on
         end
       end
     end
@@ -98,6 +102,8 @@ module Ameba
           break
         when :EOF
           break
+        else
+          # go on
         end
       end
     end