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Make name resolution errors non-fatal #30320

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merged 1 commit into from
Dec 16, 2015
Merged

Make name resolution errors non-fatal #30320

merged 1 commit into from
Dec 16, 2015

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nrc
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@nrc nrc commented Dec 11, 2015

We can now handle name resolution errors and get past type checking (if we're a bit lucky). This is the first step towards doing code completion for partial programs (we need error recovery in the parser and early access to save-analysis).

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r? @jroesch

(rust_highfive has picked a reviewer for you, use r? to override)

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nrc commented Dec 11, 2015

r? @nikomatsakis

cc @rust-lang/compiler anyone can review this, I don't think it needs any special knowledge. I'd be grateful if anyone has the time.

@@ -16,6 +16,7 @@ fn matcher1(x: opts) {
match x {
opts::a(ref i) | opts::b(i) => {}
//~^ ERROR variable `i` is bound with different mode in pattern #2 than in pattern #1
//~^^ ERROR mismatched types
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Sounds like these should be kept as typeck errors and removed from resolve.

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This looks good to me. I agree with @eddyb that reporting an error in the case of ref i vs i is unfortunate -- it feels like a "downstream error" which would be best to suppress, though it might be a pain. Could we move that "mode" checking into typeck easily enough?

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r+ modulo that question.

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nrc commented Dec 15, 2015

Seems easy enough to change to only giving a type mismatch error in that case (I hacked the change and we didn't fail any tests). However the error message is a fair bit less informative and it seems tricky to add that information to the type mismatch error, so in this case I'd be in favour of leaving the duplicate errors (or trying to suppress the type mismatch, but that is trickier and best left as a follow-up).

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nrc commented Dec 15, 2015

@bors: r=@nikomatsakis

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bors commented Dec 15, 2015

📌 Commit 18b4fe0 has been approved by @nikomatsakis

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bors commented Dec 15, 2015

⌛ Testing commit 18b4fe0 with merge 7aa94a2...

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bors commented Dec 15, 2015

💔 Test failed - auto-mac-64-nopt-t

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@bors: retry

On Mon, Dec 14, 2015 at 7:59 PM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-mac-64-nopt-t
http://buildbot.rust-lang.org/builders/auto-mac-64-nopt-t/builds/7446


Reply to this email directly or view it on GitHub
#30320 (comment).

bors added a commit that referenced this pull request Dec 15, 2015
We can now handle name resolution errors and get past type checking (if we're a bit lucky). This is the first step towards doing code completion for partial programs (we need error recovery in the parser and early access to save-analysis).
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bors commented Dec 15, 2015

⌛ Testing commit 18b4fe0 with merge bf8caf1...

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@nrc

Seems easy enough to change to only giving a type mismatch error in that case (I hacked the change and we didn't fail any tests). However the error message is a fair bit less informative and it seems tricky to add that information to the type mismatch error, so in this case I'd be in favour of leaving the duplicate errors (or trying to suppress the type mismatch, but that is trickier and best left as a follow-up).

I was thinking of trying to suppress the type mismatch, yes. OK.

Manishearth added a commit to Manishearth/rust that referenced this pull request Dec 16, 2015
We can now handle name resolution errors and get past type checking (if we're a bit lucky). This is the first step towards doing code completion for partial programs (we need error recovery in the parser and early access to save-analysis).
Manishearth added a commit to Manishearth/rust that referenced this pull request Dec 16, 2015
We can now handle name resolution errors and get past type checking (if we're a bit lucky). This is the first step towards doing code completion for partial programs (we need error recovery in the parser and early access to save-analysis).
bors added a commit that referenced this pull request Dec 16, 2015
@bors bors merged commit 18b4fe0 into rust-lang:master Dec 16, 2015
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7 participants