[Webkit-unassigned] [Bug 165477] New: Functions with a return type of ExceptionOr<String> cannot "return emptyString(); "

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165477

            Bug ID: 165477
           Summary: Functions with a return type of ExceptionOr<String>
                    cannot "return emptyString();"
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jer.noble at apple.com
                CC: lforschler at apple.com

Attempting to do so generates the following error:

 error: no viable conversion from returned value of type 'const WTF::String' to function return type 'ExceptionOr<WTF::String>'

With the following notes:

ExceptionOr.h:35:37: note: candidate constructor (the implicit copy constructor) not viable: no known conversion from 'const WTF::String' to 'const WebCore::ExceptionOr<WTF::String> &' for 1st argument
ExceptionOr.h:37:5: note: candidate constructor not viable: no known conversion from 'const WTF::String' to 'WebCore::Exception &&' for 1st argument
ExceptionOr.h:38:5: note: candidate constructor not viable: 1st argument ('const WTF::String') would lose const qualifier
ExceptionOr.h:39:88: note: candidate template ignored: disabled by 'enable_if' [with OtherType = WTF::String]

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