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andy-hanson opened this issue Jan 15, 2016 · 0 comments · Fixed by #6498
Closed

TypeError: Cannot read property 'kind' of undefined #6497

andy-hanson opened this issue Jan 15, 2016 · 0 comments · Fixed by #6498
Labels
Bug A bug in TypeScript Fixed A PR has been merged for this issue
Milestone
TypeScript 1.8

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@andy-hanson
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The following code causes the compiler to crash:

function foo() {
    for (;;) {
        const a = 0
        switch (a) {
            case 0:
                return b => b(a)
        }
    }
}

The error is:

TypeError: Cannot read property 'kind' of undefined
    at convertLoopBody (/home/andy/git/TYPESCRIPT/node_modules/typescript/lib/tsc.js:27811:45)
    at emitLoop (/home/andy/git/TYPESCRIPT/node_modules/typescript/lib/tsc.js:27797:32)
    at emitForStatement (/home/andy/git/TYPESCRIPT/node_modules/typescript/lib/tsc.js:28011:17)
    at emitJavaScriptWorker (/home/andy/git/TYPESCRIPT/node_modules/typescript/lib/tsc.js:31428:32)
    at emitNodeWithoutSourceMap (/home/andy/git/TYPESCRIPT/node_modules/typescript/lib/tsc.js:31265:21)
    at emitNodeWithSourceMap (/home/andy/git/TYPESCRIPT/node_modules/typescript/lib/tsc.js:31259:21)
    at emitNodeConsideringCommentsOption (/home/andy/git/TYPESCRIPT/node_modules/typescript/lib/tsc.js:31250:21)
    at emit (/home/andy/git/TYPESCRIPT/node_modules/typescript/lib/tsc.js:31233:17)
    at emitLinesStartingAt (/home/andy/git/TYPESCRIPT/node_modules/typescript/lib/tsc.js:26271:21)
    at emitBlockFunctionBody (/home/andy/git/TYPESCRIPT/node_modules/typescript/lib/tsc.js:29114:21)

Tested on typescript 1.8.0-dev.20160114.
@vladima vladima self-assigned this Jan 15, 2016
@vladima vladima added this to the TypeScript 1.8 milestone Jan 15, 2016
@vladima vladima mentioned this issue Jan 15, 2016
Merged
@RyanCavanaugh RyanCavanaugh added the Bug A bug in TypeScript label Jan 15, 2016
@vladima vladima added the Fixed A PR has been merged for this issue label Jan 15, 2016
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do not crash if initializer in For-statement is missing microsoft/TypeScript
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@andy-hanson @RyanCavanaugh @vladima