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diff --git a/vendor/regex/testdata/overlapping.toml b/vendor/regex/testdata/overlapping.toml
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+# NOTE: We define a number of tests where the *match* kind is 'leftmost-first'
+# but the *search* kind is 'overlapping'. This is a somewhat nonsensical
+# combination and can produce odd results. Nevertheless, those results should
+# be consistent so we test them here. (At the time of writing this note, I
+# hadn't yet decided whether to make 'leftmost-first' with 'overlapping' result
+# in unspecified behavior.)
+
+# This demonstrates how a full overlapping search is obvious quadratic. This
+# regex reports a match for every substring in the haystack.
+[[test]]
+name = "ungreedy-dotstar-matches-everything-100"
+regex = [".*?"]
+haystack = "zzz"
+matches = [
+  { id = 0, span = [0, 0] },
+  { id = 0, span = [1, 1] },
+  { id = 0, span = [0, 1] },
+  { id = 0, span = [2, 2] },
+  { id = 0, span = [1, 2] },
+  { id = 0, span = [0, 2] },
+  { id = 0, span = [3, 3] },
+  { id = 0, span = [2, 3] },
+  { id = 0, span = [1, 3] },
+  { id = 0, span = [0, 3] },
+]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+name = "greedy-dotstar-matches-everything-100"
+regex = [".*"]
+haystack = "zzz"
+matches = [
+  { id = 0, span = [0, 0] },
+  { id = 0, span = [1, 1] },
+  { id = 0, span = [0, 1] },
+  { id = 0, span = [2, 2] },
+  { id = 0, span = [1, 2] },
+  { id = 0, span = [0, 2] },
+  { id = 0, span = [3, 3] },
+  { id = 0, span = [2, 3] },
+  { id = 0, span = [1, 3] },
+  { id = 0, span = [0, 3] },
+]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+name = "repetition-plus-leftmost-first-100"
+regex = 'a+'
+haystack = "aaa"
+matches = [[0, 1], [1, 2], [0, 2], [2, 3], [1, 3], [0, 3]]
+match-kind = "leftmost-first"
+search-kind = "overlapping"
+
+[[test]]
+name = "repetition-plus-leftmost-first-110"
+regex = '☃+'
+haystack = "☃☃☃"
+matches = [[0, 3], [3, 6], [0, 6], [6, 9], [3, 9], [0, 9]]
+match-kind = "leftmost-first"
+search-kind = "overlapping"
+
+[[test]]
+name = "repetition-plus-all-100"
+regex = 'a+'
+haystack = "aaa"
+matches = [[0, 1], [1, 2], [0, 2], [2, 3], [1, 3], [0, 3]]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+name = "repetition-plus-all-110"
+regex = '☃+'
+haystack = "☃☃☃"
+matches = [[0, 3], [3, 6], [0, 6], [6, 9], [3, 9], [0, 9]]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+name = "repetition-plus-leftmost-first-200"
+regex = '(abc)+'
+haystack = "zzabcabczzabc"
+matches = [
+  [[2, 5], [2, 5]],
+  [[5, 8], [5, 8]],
+  [[2, 8], [5, 8]],
+]
+match-kind = "leftmost-first"
+search-kind = "overlapping"
+
+[[test]]
+name = "repetition-plus-all-200"
+regex = '(abc)+'
+haystack = "zzabcabczzabc"
+matches = [
+  [[2, 5], [2, 5]],
+  [[5, 8], [5, 8]],
+  [[2, 8], [5, 8]],
+  [[10, 13], [10, 13]],
+]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+name = "repetition-star-leftmost-first-100"
+regex = 'a*'
+haystack = "aaa"
+matches = [
+  [0, 0],
+  [1, 1],
+  [0, 1],
+  [2, 2],
+  [1, 2],
+  [0, 2],
+  [3, 3],
+  [2, 3],
+  [1, 3],
+  [0, 3],
+]
+match-kind = "leftmost-first"
+search-kind = "overlapping"
+
+[[test]]
+name = "repetition-star-all-100"
+regex = 'a*'
+haystack = "aaa"
+matches = [
+  [0, 0],
+  [1, 1],
+  [0, 1],
+  [2, 2],
+  [1, 2],
+  [0, 2],
+  [3, 3],
+  [2, 3],
+  [1, 3],
+  [0, 3],
+]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+name = "repetition-star-leftmost-first-200"
+regex = '(abc)*'
+haystack = "zzabcabczzabc"
+matches = [
+  [[0, 0], []],
+]
+match-kind = "leftmost-first"
+search-kind = "overlapping"
+
+[[test]]
+name = "repetition-star-all-200"
+regex = '(abc)*'
+haystack = "zzabcabczzabc"
+matches = [
+  [[0, 0], []],
+  [[1, 1], []],
+  [[2, 2], []],
+  [[3, 3], []],
+  [[4, 4], []],
+  [[5, 5], []],
+  [[2, 5], [2, 5]],
+  [[6, 6], []],
+  [[7, 7], []],
+  [[8, 8], []],
+  [[5, 8], [5, 8]],
+  [[2, 8], [5, 8]],
+  [[9, 9], []],
+  [[10, 10], []],
+  [[11, 11], []],
+  [[12, 12], []],
+  [[13, 13], []],
+  [[10, 13], [10, 13]],
+]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+name = "start-end-rep-leftmost-first"
+regex = '(^$)*'
+haystack = "abc"
+matches = [
+  [[0, 0], []],
+]
+match-kind = "leftmost-first"
+search-kind = "overlapping"
+
+[[test]]
+name = "start-end-rep-all"
+regex = '(^$)*'
+haystack = "abc"
+matches = [
+  [[0, 0], []],
+  [[1, 1], []],
+  [[2, 2], []],
+  [[3, 3], []],
+]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+name = "alt-leftmost-first-100"
+regex = 'abc|a'
+haystack = "zzabcazzaabc"
+matches = [[2, 3], [2, 5]]
+match-kind = "leftmost-first"
+search-kind = "overlapping"
+
+[[test]]
+name = "alt-all-100"
+regex = 'abc|a'
+haystack = "zzabcazzaabc"
+matches = [[2, 3], [2, 5], [5, 6], [8, 9], [9, 10], [9, 12]]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+name = "empty-000"
+regex = ""
+haystack = "abc"
+matches = [[0, 0], [1, 1], [2, 2], [3, 3]]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+name = "empty-alt-000"
+regex = "|b"
+haystack = "abc"
+matches = [[0, 0], [1, 1], [2, 2], [1, 2], [3, 3]]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+name = "empty-alt-010"
+regex = "b|"
+haystack = "abc"
+matches = [[0, 0], [1, 1], [2, 2], [1, 2], [3, 3]]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+# See: https://github.com/rust-lang/regex/issues/484
+name = "iter1-bytes"
+regex = ''
+haystack = "☃"
+matches = [[0, 0], [1, 1], [2, 2], [3, 3]]
+utf8 = false
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+# See: https://github.com/rust-lang/regex/issues/484
+name = "iter1-utf8"
+regex = ''
+haystack = "☃"
+matches = [[0, 0], [3, 3]]
+match-kind = "all"
+search-kind = "overlapping"
+
+[[test]]
+name = "iter1-incomplete-utf8"
+regex = ''
+haystack = '\xE2\x98'  # incomplete snowman
+matches = [[0, 0], [1, 1], [2, 2]]
+match-kind = "all"
+search-kind = "overlapping"
+unescape = true
+utf8 = false
+
+[[test]]
+name = "scratch"
+regex = ['sam', 'samwise']
+haystack = "samwise"
+matches = [
+  { id = 0, span = [0, 3] },
+]
+match-kind = "leftmost-first"
+search-kind = "overlapping"