[gcc r13-7879] ada: Fix spurious error on imported generic function with precondition

[Eric Botcazou]

https://gcc.gnu.org/g:c9af18f8677998e407b9f2e7fd977122969735aa

commit r13-7879-gc9af18f8677998e407b9f2e7fd977122969735aa
Author: Eric Botcazou <ebotcazou@adacore.com>
Date:   Mon Apr 10 10:15:59 2023 +0200

    ada: Fix spurious error on imported generic function with precondition
    
    It occurs during the instantiation because the compiler forgets the context
    of the generic declaration.
    
    gcc/ada/
    
            * freeze.adb (Wrap_Imported_Subprogram): Use Copy_Subprogram_Spec in
            both cases to copy the spec of the subprogram.

Diff:
---
 gcc/ada/freeze.adb | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/gcc/ada/freeze.adb b/gcc/ada/freeze.adb
index df3b5ec944e..c26c59e24ca 100644
--- a/gcc/ada/freeze.adb
+++ b/gcc/ada/freeze.adb
@@ -6066,12 +6066,6 @@ package body Freeze is
          then
             --  Here we do the wrap
 
-            --  Note on calls to Copy_Separate_Tree. The trees we are copying
-            --  here are fully analyzed, but we definitely want fully syntactic
-            --  unanalyzed trees in the body we construct, so that the analysis
-            --  generates the right visibility, and that is exactly what the
-            --  calls to Copy_Separate_Tree give us.
-
             Prag := Copy_Import_Pragma;
 
             --  Fix up spec so it is no longer imported and has convention Ada
@@ -6130,7 +6124,7 @@ package body Freeze is
                 Specification              => Copy_Subprogram_Spec (Spec),
                 Declarations               => New_List (
                   Make_Subprogram_Declaration (Loc,
-                    Specification => Copy_Separate_Tree (Spec)),
+                    Specification => Copy_Subprogram_Spec (Spec)),
                   Prag),
                 Handled_Statement_Sequence =>
                   Make_Handled_Sequence_Of_Statements (Loc,