marcoroth · marcoroth · Jun 28, 2026 · Jun 25, 2026 · Jun 28, 2026 · Jun 28, 2026
diff --git a/examples/in_as_expression.html.erb b/examples/in_as_expression.html.erb
@@ -0,0 +1,7 @@
+<h1>
+  <% if 1 in Numeric %>
+    <div>Text1</div>
+  <% else %>
+    <div>Text2</div>
+  <% end %>
+</h1>
diff --git a/src/analyze/analyze_helpers.c b/src/analyze/analyze_helpers.c
@@ -277,7 +277,13 @@ bool search_in_nodes(const pm_node_t* node, void* data) {
   analyzed_ruby_T* analyzed = (analyzed_ruby_T*) data;
 
   if (node->type == PM_IN_NODE) { analyzed->in_node_count++; }
-  if (node->type == PM_MATCH_PREDICATE_NODE) { analyzed->in_node_count++; }
+  if (node->type == PM_CASE_MATCH_NODE) {
+    const pm_case_match_node_t* case_match_node = (const pm_case_match_node_t*) node;
+
+    if (case_match_node->predicate != NULL && case_match_node->predicate->type == PM_MATCH_PREDICATE_NODE) {
+      analyzed->in_node_count++;
+    }
+  }
 
   pm_visit_child_nodes(node, search_in_nodes, analyzed);
 

diff --git a/test/parser/inline_in_test.rb b/test/parser/inline_in_test.rb
@@ -0,0 +1,85 @@
+# frozen_string_literal: true
+
+require_relative "../test_helper"
+
+module Parser
+  class InlineInTest < Minitest::Spec
+    include SnapshotUtils
+
+    test "one-line pattern match against regexp as if condition" do
+      assert_parsed_snapshot(<<~HTML)
+        <% if attribute in /...+/ %>
+          <%= attribute %>
+        <% end %>
+      HTML
+    end
+
+    test "one-line pattern match as if/else condition" do
+      assert_parsed_snapshot(<<~HTML)
+        <% if 1 in Numeric %>
+          <div>Text1</div>
+        <% else %>
+          <div>Text2</div>
+        <% end %>
+      HTML
+    end
+
+    test "one-line pattern match as unless condition" do
+      assert_parsed_snapshot(<<~HTML)
+        <% unless value in [Integer] %>
+          <%= value %>
+        <% end %>
+      HTML
+    end
+
+    test "one-line pattern match as output expression" do
+      assert_parsed_snapshot(<<~HTML)
+        <%= value in [Integer] %>
+      HTML
+    end
+
+    test "one-line pattern match as elsif condition" do
+      assert_parsed_snapshot(<<~HTML)
+        <% if value in Integer %>
+          <div>Integer</div>
+        <% elsif value in String %>
+          <div>String</div>
+        <% else %>
+          <div>Other</div>
+        <% end %>
+      HTML
+    end
+
+    test "one-line pattern match as while condition" do
+      assert_parsed_snapshot(<<~HTML)
+        <% while value in Integer %>
+          <%= value %>
+        <% end %>
+      HTML
+    end
+
+    test "one-line pattern match as until condition" do
+      assert_parsed_snapshot(<<~HTML)
+        <% until value in Done %>
+          <%= value %>
+        <% end %>
+      HTML
+    end
+
+    test "one-line pattern match in ternary expression" do
+      assert_parsed_snapshot(<<~HTML)
+        <%= (value in Integer) ? "yes" : "no" %>
+      HTML
+    end
+
+    test "one-line pattern match inside a block body" do
+      assert_parsed_snapshot(<<~HTML)
+        <% items.each do |n| %>
+          <% if n in Integer %>
+            <%= n %>
+          <% end %>
+        <% end %>
+      HTML
+    end
+  end
+end
diff --git a/...pilation_test/test_0019_in_as_expression_compilation_62286870c09e87da8fa0d1f862c811fe.txt b/...pilation_test/test_0019_in_as_expression_compilation_62286870c09e87da8fa0d1f862c811fe.txt
diff --git a/...tion_0416edce0119986c84ba03c645b50717.txt → ...tion_0416edce0119986c84ba03c645b50717.txt b/...tion_0416edce0119986c84ba03c645b50717.txt → ...tion_0416edce0119986c84ba03c645b50717.txt
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diff --git a/...ne-line_pattern_match_against_regexp_as_if_condition_27ed6d4e7e4dc6227c1a8ff7758e2b38.txt b/...ne-line_pattern_match_against_regexp_as_if_condition_27ed6d4e7e4dc6227c1a8ff7758e2b38.txt
diff --git a/...est_0002_one-line_pattern_match_as_if_else_condition_c15b8d53c5b5e902b5189db1076b3819.txt b/...est_0002_one-line_pattern_match_as_if_else_condition_c15b8d53c5b5e902b5189db1076b3819.txt
diff --git a/...test_0003_one-line_pattern_match_as_unless_condition_8005b60bf10d027fa141d4bb52027c42.txt b/...test_0003_one-line_pattern_match_as_unless_condition_8005b60bf10d027fa141d4bb52027c42.txt
diff --git a/...est_0004_one-line_pattern_match_as_output_expression_d9ec2e6b0c956487c77200fe980ba9d9.txt b/...est_0004_one-line_pattern_match_as_output_expression_d9ec2e6b0c956487c77200fe980ba9d9.txt