new test for build-scripts transitive

test/functional/toolchains/cmake/test_transitive_build_scripts.py

@@ -2,6 +2,7 @@
 
 import pytest
 
+from conan.test.assets.genconanfile import GenConanfile
 from conan.test.utils.tools import TestClient
 
 
@@ -85,6 +86,40 @@ def build(self):
     assert "MYFUNCTION CMAKE A: Hello world A!!!" in c.out
 
 
+def test_transitive_build_scripts_error():
+    # https://github.com/conan-io/conan/issues/18235
+    c = TestClient()
+    meta = textwrap.dedent("""
+        from conan import ConanFile
+
+        class Meta(ConanFile):
+            name = "meta"
+            version = "0.1"
+            package_type = "build-scripts"
+            def requirements(self):
+                self.requires("dep/0.1")
+        """)
+    product = textwrap.dedent("""
+        from conan import ConanFile
+
+        class Product(ConanFile):
+            name = "product"
+            version = "0.1"
+            package_type = "build-scripts"
+            def requirements(self):
+                self.requires("meta/0.1")
+        """)
+
+    c.save({"dep/conanfile.py": GenConanfile("dep", "0.1"),
+            "meta/conanfile.py": meta,
+            "product/conanfile.py": product})
+    c.run("create dep")
+    c.run("create meta")
+    c.run("install product")
+    # It doesn't crash
+
+
+
 @pytest.mark.tool("cmake")
 def test_reuse_macro_from_dep():
     """