bpo-41746: Add type information to asdl_seq objects (GH-22223)

* Add new capability to the PEG parser to type variable assignments. For instance:
```
       | a[asdl_stmt_seq*]=';'.small_stmt+ [';'] NEWLINE { a }
```

* Add new sequence types from the asdl definition (automatically generated)
* Make `asdl_seq` type a generic aliasing pointer type.
* Create a new `asdl_generic_seq` for the generic case using `void*`.
* The old `asdl_seq_GET`/`ast_seq_SET` macros now are typed.
* New `asdl_seq_GET_UNTYPED`/`ast_seq_SET_UNTYPED` macros for dealing with generic sequences.
* Changes all possible `asdl_seq` types to use specific versions everywhere.

1 files changed, 4 insertions, 4 deletions

diff --git a/Python/ast_unparse.c b/Python/ast_unparse.c
index e699751a05..a04ff93e9d 100644
--- a/Python/ast_unparse.c
+++ b/Python/ast_unparse.c
@@ -117,7 +117,7 @@ static int
 append_ast_boolop(_PyUnicodeWriter *writer, expr_ty e, int level)
 {
     Py_ssize_t i, value_count;
-    asdl_seq *values;
+    asdl_expr_seq *values;
     const char *op = (e->v.BoolOp.op == And) ? " and " : " or ";
     int pr = (e->v.BoolOp.op == And) ? PR_AND : PR_OR;
 
@@ -398,7 +398,7 @@ append_ast_comprehension(_PyUnicodeWriter *writer, comprehension_ty gen)
 }
 
 static int
-append_ast_comprehensions(_PyUnicodeWriter *writer, asdl_seq *comprehensions)
+append_ast_comprehensions(_PyUnicodeWriter *writer, asdl_comprehension_seq *comprehensions)
 {
     Py_ssize_t i, gen_count;
     gen_count = asdl_seq_LEN(comprehensions);
@@ -453,7 +453,7 @@ append_ast_compare(_PyUnicodeWriter *writer, expr_ty e, int level)
 {
     const char *op;
     Py_ssize_t i, comparator_count;
-    asdl_seq *comparators;
+    asdl_expr_seq *comparators;
     asdl_int_seq *ops;
 
     APPEND_STR_IF(level > PR_CMP, "(");
@@ -612,7 +612,7 @@ append_fstring_element(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec)
 /* Build body separately to enable wrapping the entire stream of Strs,
    Constants and FormattedValues in one opening and one closing quote. */
 static PyObject *
-build_fstring_body(asdl_seq *values, bool is_format_spec)
+build_fstring_body(asdl_expr_seq *values, bool is_format_spec)
 {
     Py_ssize_t i, value_count;
     _PyUnicodeWriter body_writer;