Feature gate all quasi-quoting macros.
Replaced with a single "quote" feature gate.
Check for trait impl conflicts across crates
Adding tests for closed issues

Closes #5521
Closes #9396
Closes #10714
Make cfail test error messages more precise

Closes #3192
Run all target crate tests on the windows/try bots

Previously, the check-fast and check-lite test suites weren't picking up all
target crates, rather just std/extra. In order to ensure that all of our crates
work on windows, I've modified these rules to build the test suites for all
TARGET_CRATES members. Note that this still excludes rustc/syntax/rustdoc.
auto merge of #12018 : alexcrichton/rust/triage, r=sfackler

Mostly just test suite modifications.
auto merge of #12023 : nick29581/rust/err_res, r=alexcrichton

closes #3512
auto merge of #12025 : lilac/rust/feature-gate-quote, r=brson

Closes #11630.
Removed @self and @Trait.