C# v7.x: Throw Expressions

[RexJaeschke]

This requires a bit more work.

[RexJaeschke]

This PR adds the new section, "§throw-expression-operator-new-clause The throw expression operator", which defines the grammar rule throw_expression. However, that rule is not currently reachable, so we need to figure out where to insert it in the expressions rule hierarchy.

[gafter]

Making progress!

[jskeet]

Opening up for broader review - it looks like this still has quite a bit that needs doing though.

[BillWagner]

Opening up for broader review - it looks like this still has quite a bit that needs doing though.

I gave it a thorough read. I don't have any additional comments beyond what Neal and Nigel have already noted.

[jskeet]

If both Nigel and Neal are present in today's meeting, let's talk about the grammar aspect then.

[jskeet]

Action: @gafter to apply his own suggestions. We have persuaded @Nigel-Ecma that leaving the prohibition of throw throw throw can be semantic.

[gafter]

I think I've made all the changed that we have discussed. This is ready for further review.

[gafter]

I don't know how to fix the section numbering issues.

[BillWagner]

@jskeet

I took another look at this while I was rebasing the V7 PRs. I think this is very close. The remaining concern is related to modifying the grammar or allowing the syntactic ambiguity and relying on the prose to disallow throw throw throw.

The next meeting where both @Nigel-Ecma and @gafter are present, we can resolve this and accept it with necessary recomendations.

[Nigel-Ecma]

Oops, my "comment" became a "review", must have hit the wrong button, nothing to add here to the comment!

[Nigel-Ecma]

Just one minor fix and this is approved. I've recommended leaving the grammar as is in the debate over style.

[BillWagner]

This LGTM @jskeet

Let's merge #628, then manage the conflicts here, and merge this.