parse_string.c: free "str"

[skrah]

BPO	40883
Nosy	@skrah, @lysnikolaou, @pablogsal, @miss-islington
PRs	bpo-40883: Fix memory leak in fstring_compile_expr in parse_string.c #20667 [3.9] bpo-40883: Fix memory leak in fstring_compile_expr in parse_string.c (GH-20667) #20669

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-06-06.00:44:52.989>
created_at = <Date 2020-06-05.22:56:57.315>
labels = []
title = 'parse_string.c: free "str"'
updated_at = <Date 2020-06-06.00:44:52.988>
user = 'https://github.com/skrah'

bugs.python.org fields:

activity = <Date 2020-06-06.00:44:52.988>
actor = 'pablogsal'
assignee = 'none'
closed = True
closed_date = <Date 2020-06-06.00:44:52.989>
closer = 'pablogsal'
components = []
creation = <Date 2020-06-05.22:56:57.315>
creator = 'skrah'
dependencies = []
files = []
hgrepos = []
issue_num = 40883
keywords = ['patch']
message_count = 3.0
messages = ['370795', '370797', '370799']
nosy_count = 4.0
nosy_names = ['skrah', 'lys.nikolaou', 'pablogsal', 'miss-islington']
pr_nums = ['20667', '20669']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue40883'
versions = []

[skrah]

Also in test_decimal, there's a small leak here:

==10040== 24 bytes in 1 blocks are definitely lost in loss record 549 of 5,095
==10040== at 0x4C2DE56: malloc (vg_replace_malloc.c:299)
==10040== by 0x643B33: fstring_compile_expr (parse_string.c:594)
==10040== by 0x643B33: fstring_find_expr (parse_string.c:924)
==10040== by 0x643B33: fstring_find_literal_and_expr (parse_string.c:1076)
==10040== by 0x643B33: _PyPegen_FstringParser_ConcatFstring (parse_string.c:1293)
==10040== by 0x644569: fstring_parse (parse_string.c:1409)
==10040== by 0x644569: fstring_find_expr (parse_string.c:980)
==10040== by 0x644569: fstring_find_literal_and_expr (parse_string.c:1076)
==10040== by 0x644569: _PyPegen_FstringParser_ConcatFstring (parse_string.c:1293)
==10040== by 0x62CE94: _PyPegen_concatenate_strings (pegen.c:2003)
==10040== by 0x62EF52: strings_rule (parse.c:10834)
==10040== by 0x62EF52: atom_rule (parse.c:10674)
==10040== by 0x6389A2: t_primary_raw (parse.c:14042)
==10040== by 0x6389A2: t_primary_rule (parse.c:13839)
==10040== by 0x638D67: star_target_rule (parse.c:12684)
==10040== by 0x6392FC: star_targets_rule (parse.c:12501)
==10040== by 0x63BD7B: _tmp_135_rule (parse.c:23255)
==10040== by 0x63BD7B: _loop1_22_rule (parse.c:16468)
==10040== by 0x63BD7B: assignment_rule (parse.c:2116)
==10040== by 0x63BD7B: small_stmt_rule (parse.c:1508)
==10040== by 0x63DB44: simple_stmt_rule (parse.c:1406)
==10040== by 0x63F995: statement_rule (parse.c:1240)
==10040== by 0x63F995: _loop1_11_rule (parse.c:15835)
==10040== by 0x63F995: statements_rule (parse.c:1175)
==10040== by 0x63FB49: block_rule (parse.c:6127)

[pablogsal]

New changeset a54096e by Pablo Galindo in branch 'master':
bpo-40883: Fix memory leak in fstring_compile_expr in parse_string.c (GH-20667)
a54096e

[miss-islington]

New changeset 79e6c15 by Miss Islington (bot) in branch '3.9':
bpo-40883: Fix memory leak in fstring_compile_expr in parse_string.c (GH-20667)
79e6c15