> On Oct 16, 2017, at 9:20 AM, Sam Ding via swift-dev <swift-dev@swift.org>
> wrote:
> I test the case "tuple_arguments.swift" for v4.0 and found it is failed when
> the swift compiler is built in "-d" debug mode, but it is passed
> when built in release mode.
> Here is a simple test case:
>
> // SR-4738
>
> let sr4738 = (1, (2, 3))
> [sr4738].map { (x, (y, z)) -> Int in x + y + z } // expected-error {{use of
> undeclared type 'y'}}
> // expected-error@-1 {{closure tuple parameter does not support
> destructuring}} {{20-26=arg1}} {{38-38=let (y, z) = arg1
> ; }}
>
> Save it to a file (for example, tt.swift), then run following commands:
>
> ` swift -frontend -target x86_64-unknown-linux-gnu -module-cache-path /tmp/
> -swift-version 3 -typecheck -verify
> -disable-objc-attr-requires-foundation-module tt.swift -swift-version 4 `
>
> If "swift" compiler is built with debug mode ("-d"), then got following
> output:
> tt.swift:5:96: error: expected fix-it not seen; actual fix-its:
> {{20-26=arg1}} {{38-38=let = arg1; }}
> .....
> Stack dump:
> 0. Program arguments: swift -frontend -target x86_64-unknown-linux-gnu
> -module-cache-path /tmp/ -swift-version 3 -typecheck -verify
> -disable-objc-attr-requires-foundation-module tt.swift -swift-version 4
> Aborted (core dumped)
>
> The testing "lib/Frontend/DiagnosticVerifier.cpp:: checkForFixIt" gives that
> the "ActualFixIt" is "let " and "Expected" is "let (y, z) = arg1", and then
> causes "core dumped" in an assert.
> However the both "ActualFixIt" and "Expected" match when the "swift" is built
> in release mode.
> Note that the all "fixed-it"s are stored in a list, originally is added by
> "DiagnosticVerifier::addDiagnostic"
>
> Can anyone let me know how the compiler build options affect the test results.
> I tested the same case on s390x and found the similar errors.
That error looks like the swift compiler frontend process is crashing during
the test. The build configuration of the compiler can definitely affect crashes
of the compiler itself. Have you filed a bug report?
--
Greg Parker gpar...@apple.com <mailto:gpar...@apple.com> Runtime
Wrangler
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