Improve error message when given location points to no macro

src/compiler/crystal/tools/expand.cr

@@ -67,6 +67,7 @@ module Crystal
   class ExpandVisitor < Visitor
     def initialize(@target_location : Location)
       @nodes = [] of ASTNode
+      @message = "no expansion found"
     end
 
     def process_type(type)
@@ -105,15 +106,31 @@ module Crystal
       result.node.accept(self)
 
       if @nodes.empty?
-        return ExpandResult.new("failed", "no expansion found")
+        return ExpandResult.new("failed", @message)
       else
         res = ExpandResult.new("ok", "#{@nodes.size} expansion#{@nodes.size > 1 ? "s" : ""} found")
         res.expansions = @nodes.map { |node| ExpandTrace.build(node) }
         return res
       end
     end
 
-    def visit(node : Call | MacroFor | MacroIf | MacroExpression)
+    def visit(node : Call)
+      if loc_start = node.location
+        loc_end = node.name_end_location
+        if @target_location.between?(loc_start, loc_end)
+          if node.expanded
+            @nodes << node
+          else
+            @message = "no expansion found: #{node} is not macro"
+          end
+          false
+        else
+          contains_target(node)
+        end
+      end
+    end
+
+    def visit(node : MacroFor | MacroIf | MacroExpression)
       if loc_start = node.location
         loc_end = node.end_location || loc_start
         if @target_location.between?(loc_start, loc_end) && node.expanded