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Bug: Cannot read property 'flags' of undefined #2127
Description
Trying to compile
interface IBar {
[barId: string]: any;
}
interface IFoo {
foo<TBar extends IBar>(bar: TBar, bar1: (bar: TBar)=>any, bar2: (bar: TBar)=>any);
}
var foo: IFoo;
foo.foo({bar: null}, bar => null, bar => null);
leads to the following error
if (source.flags & 128 /* Enum */ && target === numberType
^
TypeError: Cannot read property 'flags' of undefined
at isRelatedTo (tsc.js:13077:31)
at checkTypeRelatedTo (tsc.js:13048:26)
at checkTypeSubtypeOf (tsc.js:13029:20)
at reportNoCommonSupertypeError (tsc.js:13618:13)
at resolveCall (tsc.js:14945:21)
at resolveCallExpression (tsc.js:15075:20)
at getResolvedSignature (tsc.js:15125:47)
at checkCallExpression (tsc.js:15140:29)
at checkExpressionWorker (tsc.js:15648:28)
at checkExpressionOrQualifiedName (tsc.js:15605:42)
tsc version 1.4.1.0
You can also put this code into the typescript Playground, which does not complie it as well.
Activity
ahejlsberg commentedon Feb 24, 2015
Jason Freeman (@JsonFreeman) Jason, the crash is caused by
reportNoCommonSupertypeErrorcomputing the valueundefinedforbestSupertypeDownfallTypeand then passing that tocheckTypeSubtypeOf.ahejlsberg commentedon Feb 24, 2015
It's not entirely clear to me what that logic is doing. I think you wrote it, so I'm assigning the bug to you.
JsonFreeman commentedon Feb 24, 2015
Yeah I wrote that, so I can take a look. Thanks.