Merge branch 'topic/fix_kp_19312' into 'master'

Fix the KP-19312 detector

Closes #412

See merge request eng/libadalang/langkit-query-language!352

lkql_checker/share/lkql/kp/KP-19312.lkql

@@ -5,5 +5,5 @@ fun kp_19312(node) =
     |" Flag "for" loop specs which define an iteration filter and which iterate
     |" over a type which defines the "iterable" aspect.
     node is ForLoopSpec
-    when node.f_iter_expr.p_expression_type()?.p_has_aspect?("iterable")
-     and node.f_iter_filter is not null
+    when node.f_iter_filter is not null
+     and node.f_iter_expr is e@Expr when (e.p_expression_type()?.p_has_aspect?("iterable"))

testsuite/tests/checks/KP-19312/main.adb

@@ -40,6 +40,10 @@ begin
       Put_Line ("Elem: " & Elem'Image);
    end loop;
 
+   for Elem in Integer range 1 .. 10 loop --  NOFLAG
+      Put_Line ("Elem: " & Elem'Image);
+   end loop;
+
    for Elem of I loop                   --  NOFLAG
       Put_Line ("Elem: " & Elem'Image);
    end loop;

testsuite/tests/checks/KP-19312/test.out

@@ -2,11 +2,11 @@ main.adb:35:44: rule violation: possible occurrence of KP 19312
 35 |    S_1 : constant Integer_Sets.Set := [for E of I when False => E];  --  FLAG
    |                                            ^^^^^^^^^^^^^^^^^
 
-main.adb:47:8: rule violation: possible occurrence of KP 19312
-47 |    for Elem in I when False loop        --  FLAG
+main.adb:51:8: rule violation: possible occurrence of KP 19312
+51 |    for Elem in I when False loop        --  FLAG
    |        ^^^^^^^^^^^^^^^^^^^^
 
-main.adb:51:8: rule violation: possible occurrence of KP 19312
-51 |    for Elem of I when False loop        --  FLAG
+main.adb:55:8: rule violation: possible occurrence of KP 19312
+55 |    for Elem of I when False loop        --  FLAG
    |        ^^^^^^^^^^^^^^^^^^^^