The following reduced code used to work with 2.072.2: import std.stdio : writeln; import std.regex : ctRegex, matchAll, regex, splitter; import std.algorithm : joiner, map; string message = "fix issue 16319 and fix std.traits.isInnerClass"; static auto matchToRefs(M)(M m) { enum splitRE = regex(`[^\d]+`); // ctRegex throws a weird error in unittest compilation return m.captures[5].splitter(splitRE); } // see https://github.com/github/github-services/blob/2e886f407696261bd5adfc99b16d36d5e7b50241/lib/services/bugzilla.rb#L155 enum issueRE = ctRegex!(`((close|fix|address)e?(s|d)? )?(ticket|bug|tracker item|issue)s?:? *([\d ,\+&#and]+)`, "i"); message.matchAll(issueRE).map!matchToRefs.joiner.writeln; it fails with: dlang/phobos/std/algorithm/iteration.d(2446): Error: cannot modify struct copy._items MapResult!(matchToRefs, RegexMatch!(string, BacktrackingMatcher)) with immutable members dlang/phobos/std/algorithm/iteration.d(2443): Error: function std.algorithm.iteration.joiner!(MapResult!(matchToRefs, RegexMatch!(string, BacktrackingMatcher))).joiner.Result.save no return exp; or assert(0); at end of function bugzilla.d(16): Error: template instance std.algorithm.iteration.joiner!(MapResult!(matchToRefs, RegexMatch!(string, BacktrackingMatcher))) error instantiating According to digger this is due to: https://github.com/dlang/phobos/pull/4286
https://github.com/dlang/phobos/pull/5042
Commits pushed to stable at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/4d19d0ad3aab77a9a4a9b2dedaccbacfdeb4e45e Fix issue 17066 https://github.com/dlang/phobos/commit/8986f149c7c9ff9e5333e6a9427b5799e8576c50 Merge pull request #5042 from DmitryOlshansky/fix-issue-17066 Fix issue 17066
Commits pushed to master at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/4d19d0ad3aab77a9a4a9b2dedaccbacfdeb4e45e Fix issue 17066 https://github.com/dlang/phobos/commit/8986f149c7c9ff9e5333e6a9427b5799e8576c50 Merge pull request #5042 from DmitryOlshansky/fix-issue-17066
Commits pushed to newCTFE at https://github.com/dlang/phobos https://github.com/dlang/phobos/commit/4d19d0ad3aab77a9a4a9b2dedaccbacfdeb4e45e Fix issue 17066 https://github.com/dlang/phobos/commit/8986f149c7c9ff9e5333e6a9427b5799e8576c50 Merge pull request #5042 from DmitryOlshansky/fix-issue-17066
cat > bug.d << CODE import std.algorithm : joiner, map; auto matchIssueRefs(string message) { import std.regex; return message.matchAll(`a|b`).joiner; } void getIssueRefs(string[] messages) { messages.map!(m => m.matchIssueRefs).joiner; } CODE dmd -c -o- bug ---- /usr/include/dmd/phobos/std/algorithm/iteration.d-mixin-2442(2456): Error: cannot modify struct this._current Result with immutable members bug.d(11): Error: template instance std.algorithm.iteration.joiner!(MapResult!(__lambda2, string[])) error instantiating ---- Thanks for the fix, but it only seems to solves half of the problem, still getting this error with a nested `joiner`.
Regex was reverted