Mark std.stdio.File.fdopen as safe and trusted
(last)indexOfAny(index)

whitespace

some code reductions

faster

some last fixes, I hope

typo

walkLength
Trivial documentation fix for issue 12557

gcd is implemented with Euclid's algorithm, not Euler's algorithm.
https://issues.dlang.org/show_bug.cgi?id=12557
Merge pull request #2168 from gyrovague/master

Trivial documentation fix for issue 12557
Fix issue 12366 Range violation in compile-time regex

Back-references are not a part of "quick-test" in R-T version,
neither should they be in C-T.
Merge pull request #2171 from DmitryOlshansky/issue-12366

Fix issue 12366 Range violation in compile-time regex
isValidFilename() to range
Merge pull request #2083 from tom-tan/master

Mark std.stdio.File.fdopen as safe and trusted
Merge pull request #2173 from WalterBright/isvalidfilename-range

isValidFilename() to range
Merge pull request #1952 from burner/last_indexOfAny_index

(last)indexOfAny(index)
Fix issue 12747 std.regex bug in the parser allows reference to open groups.

Check the stack of opened constructs for groups when emit back-refs.