Test plan for "dictionary expressions" feature

[jcouv]

Proposal: dictionary-expressions.md

Compiler

• parsing Restore parsing from old branch #81705
• LangVer
• extension indexers

Productivity

• completion for key and value
• classification for :
• upgrade from existing syntax

Errata

• Ifdef'ed out "PROTO TYPE" code: // PROTO TYPE: Handle collection arguments in flow analysis: report CS8620 for 'with(c3)'.: https://github.com/dotnet/roslyn/pull/82030/changes#diff-86184b0cfd0b689450f2d6b043a962b7405ffdf8664a15d93f3441003d2eafdeR6999
• IFDEF'ed out code in IDE to support 'use collection expression' with key/value pairs. Search for // Enable when dictionary-expressions come online.

[MihuBot]

I'm a bot. Here is a possible related and/or duplicate issue (I may be wrong):

• Test plan for Dictionary Expressions #76310