Merge pull request #9 from rust-lang/minutes-2020-03-03

Add meeting notes for design meeting 2020-03-03

Author: detrumi

minutes/design-2020-03-03.md

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+# traits design meeting 2020.03.03
+
+## topic
+
+Half-way point to the first sprint
+
+[Zulip thread](https://rust-lang.zulipchat.com/#narrow/stream/144729-wg-traits/topic/design.20meeting.202020.2E03.2E03/near/189633304)
+
+## summary
+
+Key points in the discussion:
+* [upcoming design meeting on library-ifying chalk-ty/rustc-ty](https://rust-lang.zulipchat.com/#narrow/stream/144729-wg-traits/topic/design.20meeting.202020.2E03.2E03/near/189633985)
+* [planning and the skill tree](https://rust-lang.zulipchat.com/#narrow/stream/144729-wg-traits/topic/design.20meeting.202020.2E03.2E03/near/189635407)
+* [next steps for integrating `impl Trait` in RA](https://rust-lang.zulipchat.com/#narrow/stream/144729-wg-traits/topic/design.20meeting.202020.2E03.2E03/near/189636191)
+* [mapping types between rustc and chalk](https://rust-lang.zulipchat.com/#narrow/stream/144729-wg-traits/topic/design.20meeting.202020.2E03.2E03/near/189636724)
+    - [types mapping table](https://rust-lang.github.io/chalk/book/types/rust_types.html#mapping-to-rustc-types)
+    - [types in RA](https://github.com/rust-analyzer/rust-analyzer/blob/5abc45982b5558d4c5f8753cb531a4a0858faa0f/crates/ra_hir_ty/src/lib.rs#L71-L145)
+* [ambiguous associated types, which are problematic for rust-analyzer](https://rust-lang.zulipchat.com/#narrow/stream/144729-wg-traits/topic/design.20meeting.202020.2E03.2E03/near/189637861)
+* [things "left" this sprint](https://rust-lang.zulipchat.com/#narrow/stream/144729-wg-traits/topic/design.20meeting.202020.2E03.2E03/near/189639234):
+    1. impl Trait
+    2. tracing
+    3. Finishing `Interner` refactoring