gh-40774: fix script and remove deprecated stuff
    
fix the script used to find deprecation ;

remove deprecated things in

File: src/sage/combinat/binary_tree.py ; PR: #36394 ; Closed Date:
2023-10-14
File: src/sage/categories/metric_spaces.py ; PR: #30062 ; Closed Date:
2020-08-02

### 📝 Checklist

- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
    
URL: #40774
Reported by: Frédéric Chapoton
Reviewer(s): Tobias Diez

Author: Release Manager

src/sage/categories/metric_spaces.py

@@ -2,15 +2,14 @@
 r"""
 Metric Spaces
 """
-#*****************************************************************************
+# ***************************************************************************
 #  Copyright (C) 2015 Travis Scrimshaw <tscrim at ucdavis.edu>
 #
 #  Distributed under the terms of the GNU General Public License (GPL)
-#                  http://www.gnu.org/licenses/
-#******************************************************************************
+#                  https://www.gnu.org/licenses/
+# ***************************************************************************
 
 from sage.misc.cachefunc import cached_method
-from sage.misc.superseded import deprecated_function_alias
 from sage.categories.category import Category
 from sage.categories.category_with_axiom import CategoryWithAxiom
 from sage.categories.cartesian_product import CartesianProductsCategory
@@ -161,9 +160,7 @@ def metric_function(self):
                 sage: m(p1, p2)
                 2.23230104635820
             """
-            return lambda a,b: a.dist(b)
-
-        metric = deprecated_function_alias(30062, metric_function)
+            return lambda a, b: a.dist(b)
 
         def dist(self, a, b):
             """

src/sage/combinat/binary_tree.py

@@ -38,11 +38,10 @@
 from sage.sets.disjoint_union_enumerated_sets import DisjointUnionEnumeratedSets
 from sage.sets.family import Family
 from sage.misc.cachefunc import cached_method
-from sage.misc.superseded import deprecated_function_alias
 
 
 class BinaryTree(AbstractClonableTree, ClonableArray,
-        metaclass=InheritComparisonClasscallMetaclass):
+                 metaclass=InheritComparisonClasscallMetaclass):
     """
     Binary trees.
 
@@ -3272,8 +3271,6 @@ def under(self, bt):
         else:
             return B([self.under(bt[0]), bt[1]])
 
-    _backslash_ = deprecated_function_alias(36394, under)
-
     def under_decomposition(self):
         r"""
         Return the unique maximal decomposition as an under product.

tools/check_deprecations.py

@@ -36,6 +36,8 @@ def search_deprecations(path: str) -> set[tuple[str, int]]:
                 content = f.read()
                 matches = DEPRECATION_PATTERN.findall(content)
                 for match in matches:
+                    if isinstance(match, tuple):
+                        match = match[1]
                     deprecations.add((str(filepath), int(match)))
         except (PermissionError, UnicodeDecodeError):
             pass