Note tag label names and definitions

Label	Meaning
A-an-interesting-project	put label description here
A-android	put label description here
A-attributes	put label description here
A-build	put label description here
A-codegen	put label description here
A-concurrency	put label description here
A-debuginfo	put label description here
A-destructors	put label description here
A-diagnostics	put label description here
A-docs	put label description here
A-driver	put label description here
A-freebsd	put label description here
A-frontend	put label description here
A-grammar	put label description here
A-iOS	put label description here
A-infrastructure	put label description here
A-instrumentation	put label description here
A-libs	put label description here
A-linkage	put label description here
A-lint	put label description here
A-linux	put label description here
A-llvm	put label description here
A-macos	put label description here
A-metadata	put label description here
A-parser	put label description here
A-pkg	put label description here
A-pretty	put label description here
A-regions	put label description here
A-resolve	put label description here
A-runtime	put label description here
A-rustdoc	put label description here
A-rusti	put label description here
A-syntaxext	put label description here
A-testsuite	put label description here
A-tools	put label description here
A-traits	put label description here
A-typesystem	put label description here
A-versioning	put label description here
A-windows	put label description here
B-RFC	put label description here
B-clarifying	put label description here
B-reproduce	put label description here
E-easy	put label description here
E-hard	put label description here
I-ICE	put label description here
I-cleanup	put label description here
I-completion	put label description here
I-crash	put label description here
I-enhancement	put label description here
I-nominated	put label description here
I-papercut	put label description here
I-slow	put label description here
I-wishlist	put label description here
I-wrong	put label description here
metabug	put label description here