Apply suggestions from code review

Co-authored-by: Rasmus Wriedt Larsen <rasmuswl@github.com>

Author: yoff

python/downgrades/47e552c4357a04c5735355fad818630daee4a5ac/py_stmts.ql

@@ -14,6 +14,7 @@ class StmtList_ extends @py_stmt_list {
  */
 bindingset[new_index]
 int old_index(int new_index) {
+  not new_index = 7 and
   if new_index < 7 then result = new_index else result + (8 - 7) = new_index
 }
 

python/ql/lib/change-notes/2022-11-14-grouped-exceptions-breaking.md

@@ -1,4 +1,4 @@
 ---
 category: breaking
 ---
-* `Try::getAHandler` no longer returns an `ExceptStmt`, as handlers may also be `ExceptGroupStmt`s. Instead, it returns a plain `Stmt`. This means that code of the form `try.getAHandler().getType()` will no longer work. Instead, use `try.getANormalHandler().getType()` or `try.getAGroupHandler().getType()`, depending on your use case.
+* `Try.getAHandler()` and `Try.getHandler(<index>)` have results of type `Stmt` instead of `ExceptStmt`, as handlers may also be `ExceptGroupStmt`s (After Python 3.11 introduced PEP 654). This means that code of the form `try.getAHandler().getType()` will no longer work. Instead, use `try.getANormalHandler().getType()` or `try.getAGroupHandler().getType()`, depending on your use case.

python/ql/lib/semmle/python/Stmts.qll

@@ -145,7 +145,6 @@ class Exec extends Exec_ {
 
 /** An except group statement (part of a `try` statement), such as `except* IOError as err:` */
 class ExceptGroupStmt extends ExceptGroupStmt_ {
-  /* syntax: except Expr [ as Expr ]: */
   /** Gets the immediately enclosing try statement */
   Try getTry() { result.getAHandler() = this }
 

python/ql/lib/semmle/python/essa/Essa.qll

@@ -522,7 +522,7 @@ class ExceptionCapture extends EssaNodeDefinition {
    * `ExceptionType` in `except ExceptionType as ex:`.
    */
   ControlFlowNode getType() {
-    exists(ExceptGroupFlowNode ex |
+    exists(ExceptFlowNode ex |
       ex.getName() = this.getDefiningNode() and
       result = ex.getType()
     )

python/ql/lib/semmle/python/types/Exceptions.qll

@@ -453,7 +453,7 @@ class ExceptGroupFlowNode extends ControlFlowNode {
 
   /**
    * Gets the type handled by this exception handler.
-   * `eg` in `except* eg as e:`
+   * `ExceptionType` in `except* ExceptionType as e:`
    */
   ControlFlowNode getType() {
     this.getBasicBlock().dominates(result.getBasicBlock()) and
@@ -462,7 +462,7 @@ class ExceptGroupFlowNode extends ControlFlowNode {
 
   /**
    * Gets the name assigned to the handled exception, if any.
-   * `e` in `except* eg as e:`
+   * `e` in `except* ExceptionType as e:`
    */
   ControlFlowNode getName() {
     this.getBasicBlock().dominates(result.getBasicBlock()) and