Add test for block imports access

testing/templates/extend_and_import.html

@@ -0,0 +1,3 @@
+{% import "macro.html" as m1 %}
+
+{% block header %}{% endblock %}

testing/tests/extend.rs

@@ -0,0 +1,27 @@
+use askama::Template;
+
+#[derive(Template)]
+#[template(
+    source = r#"{% extends "extend_and_import.html" %}
+{%- import "macro.html" as m2 -%}
+
+{%- macro another(param) -%}
+
+--> {{ param }}
+
+{%- endmacro -%}
+
+{% block header -%}
+{% call m1::twice(1) %}
+{% call m2::twice(2) %}
+{% call another(3) %}
+{%- endblock -%}
+"#,
+    ext = "txt"
+)]
+struct A;
+
+#[test]
+fn test_macro_in_block_inheritance() {
+    assert_eq!(A.render().unwrap(), "\n\n1 1\n2 2\n--> 3");
+}

testing/tests/ui/block_and_vars.rs

@@ -0,0 +1,13 @@
+use askama::Template;
+
+#[derive(Template)]
+#[template(source = r#"{% extends "extend_and_import.html" %}
+
+{% let x = 12 %}
+{% block header -%}
+{{ x }}
+{% endblock %}"#, ext = "html")]
+struct A;
+
+fn main() {
+}

testing/tests/ui/block_and_vars.stderr

@@ -0,0 +1,7 @@
+error[E0609]: no field `x` on type `&A`
+ --> tests/ui/block_and_vars.rs:3:10
+  |
+3 | #[derive(Template)]
+  |          ^^^^^^^^ unknown field
+  |
+  = note: this error originates in the derive macro `Template` (in Nightly builds, run with -Z macro-backtrace for more info)