Make BaseFormalParamDecl.decl_param supports AcceptStmt parameters

Only parameters from bodies were considered by `decl_param` but
`ParamSpec`s from accept statements should also be supported (the
parameter declaration in that case is the one from the corresponding
entry).

ada/ast.py

@@ -4510,11 +4510,15 @@ def get_param(part=T.BasicDecl.entity, param=T.Symbol):
                       dynamic_vars=[default_imprecise_fallback()])
     def decl_param(param=T.DefiningName.entity):
         """
-        If self is a ParamSpec of a subprogram body, go fetch the equivalent
-        spec in the subprogram decl.
+        If self is a ParamSpec of a subprogram body or of an accept stmt, go
+        fetch the equivalent spec in the subprogram decl.
         """
         return Entity.get_param(
-            Entity.parent_decl.cast(T.BaseSubpBody)._.decl_part,
+            Entity.semantic_parent.match(
+                lambda body=T.BaseSubpBody: body.decl_part,
+                lambda accept=T.AcceptStmt: accept.corresponding_entry,
+                lambda _: No(T.BasicDecl.entity)
+            ),
             param.name_symbol
         )._or(param)
 

testsuite/tests/name_resolution/gnat_compare_entry_param/prj.gpr

@@ -0,0 +1,4 @@
+project Prj is
+  for Source_Dirs use (".");
+  for Main use ("test.adb");
+end Prj;

testsuite/tests/name_resolution/gnat_compare_entry_param/test.adb

@@ -0,0 +1,17 @@
+procedure Test is
+   task T is
+      entry E (C1 : Integer; C2 : Boolean);
+   end T;
+
+   task body T is
+      X : Integer;
+   begin
+      accept E (C1 : Integer; C2 : Boolean) do
+         if C2 then
+            X := C1;
+         end if;
+      end E;
+   end T;
+begin
+   null;
+end Test;

testsuite/tests/name_resolution/gnat_compare_entry_param/test.out

@@ -0,0 +1,21 @@
+== test.adb ==
+test.adb:1:11 => test.adb:1:11 (LAL: ok)
+test.adb:3:16 => test.adb:3:13 (LAL: ok)
+test.adb:3:30 => test.adb:3:13 (LAL: ok)
+test.adb:6:14 => test.adb:2:9 (LAL: ok)
+test.adb:9:14 => test.adb:3:13 (LAL: ok)
+test.adb:10:13 => test.adb:3:30 (LAL: ok)
+test.adb:11:13 => test.adb:7:7 (LAL: ok)
+test.adb:11:18 => test.adb:3:16 (LAL: ok)
+test.adb:13:11 => test.adb:3:13 (LAL: ok)
+test.adb:14:8 => test.adb:2:9 (LAL: ok)
+test.adb:17:5 => test.adb:1:11 (LAL: ok)
+
+Stats:
+GNAT xrefs have 11 entries
+LAL xrefs have:
+  * 11 OK entries (100.00%)
+  * 0 DIFFERENT entries (0.00%)
+  * 0 ERROR entries (0.00%)
+  * 0 MISSING entries (0.00%)
+  * 0 ADDITIONAL entries (0.00%)

testsuite/tests/name_resolution/gnat_compare_entry_param/test.yaml

@@ -0,0 +1,2 @@
+driver: gnat-compare
+project_file: prj.gpr