[Webkit-unassigned] [Bug 169778] New: import(arg) crashes when ToString(arg) throws

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169778

            Bug ID: 169778
           Summary: import(arg) crashes when ToString(arg) throws
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gsathya at chromium.org

Test case:

let x = { get toString() { throw new Error('wat'); } };
import(x);

Expected result :
a new rejected promise is created

Actual result :
Safari crashes and reloads the page

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