panic: runtime error: invalid memory address or nil pointer dereference [recovered, repanicked]
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x6675f2]

goroutine 146 [running]:
sync.(*WaitGroup).Go.func1.1()
	/usr/local/go/src/sync/waitgroup.go:251 +0x45
panic({0xe3d900?, 0x1fbbd00?})
	/usr/local/go/src/runtime/panic.go:860 +0x13a
github.com/microsoft/TypeScript/tsc/internal/ast.IsPartOfTypeNode(0x6e07920f908?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/ast/utilities.go:2059 +0x12
github.com/microsoft/TypeScript/tsc/internal/checker.(*TupleNormalizer).normalize(0x6e079b9d9d0, 0x6e07920f908, {0x6e078780650, 0x2, 0x6e079b9d9d8?}, {0x6e079a792e0, 0x2, 0x992a3a?})
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23721 +0x365
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).createNormalizedTupleTypeEx(0x6e07920f908, 0x6e078b248c0?, {0x6e078780650, 0x2, 0x2?}, 0x0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23676 +0xea
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).createNormalizedTupleType(...)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23693
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).createNormalizedTypeReference(0x15d9da0?, 0x6e07920f908?, {0x6e078780650?, 0x2?, 0x2?})
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23639 +0x25
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).instantiateTypeWorker(0x6e07920f908, 0x6e078b82a80, 0x6e0788a2ac0, 0x0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:22575 +0x197
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).instantiateTypeWithAlias(0x6e07920f908, 0x6e078b82a80, 0x6e0788a2ac0, 0x0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:22477 +0x6c5
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).instantiateType(...)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:22442
github.com/microsoft/TypeScript/tsc/internal/checker.(*CompositeTypeMapper).Map(0x6e079a81d70, 0x6e078b81490)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/mapper.go:289 +0x4d
github.com/microsoft/TypeScript/tsc/internal/checker.(*TypeMapper).Map(...)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/mapper.go:26
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTailRecursionRoot.func1(...)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:24805
github.com/microsoft/TypeScript/tsc/internal/core.Map[...](...)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/core/core.go:86
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTailRecursionRoot(0x6e07920f908?, 0x6e07883e000?, 0x6e0788a2ac0?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:24805 +0x2fd
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getConditionalType(0x6e07920f908, 0x6e079b85ad0?, 0x6e078546128?, 0x0, 0x6e078546100?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:24747 +0x885
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getConditionalTypeInstantiation(0x6e07920f908, 0x10000008bf9e6?, 0x7fb34809fe08?, 0x0, 0x6e079a79160)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:22850 +0x372
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).instantiateTypeWorker(0x6e07920f908, 0x6e078c2a900, 0x6e078c255c0, 0x6e079a79160)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:22616 +0x607
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).instantiateTypeWithAlias(0x6e07920f908, 0x6e078c2a900, 0x6e078c255c0, 0x6e079a79160)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:22477 +0x6c5
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeAliasInstantiation(0x6e07920f908, 0x6e0787ce4e0, {0x6e078881040, 0x1, 0x1}, 0x6e079a79160)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:24000 +0x39d
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeFromTypeAliasReference(0x6e07920f908, 0x6e07883e040, 0x6e0787ce4e0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23974 +0x4c5
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeReferenceType(0x6e07920f908?, 0x6e07883e040?, 0x6e07883e040?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23495 +0x95
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeFromTypeReference(0x6e07920f908, 0x6e07883e040)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23355 +0x117
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeFromTypeNodeWorker(0x6e079b85a70?, 0x6e078b02cc0?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23198 +0x37f
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeFromTypeNode(0x6e07920f908, 0x6e07883e040)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23149 +0x1d
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getDeclaredTypeOfTypeAlias(0x6e07920f908, 0x6e078b02cc0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:24197 +0xea
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).tryGetDeclaredTypeOfSymbol(0x0?, 0x423945?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:24026 +0x66
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getDeclaredTypeOfSymbol(...)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:24012
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeFromTypeAliasReference(0x6e07920f908, 0x6e07883e080, 0x6e078b02cc0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23934 +0xcc
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeReferenceType(0x6e07920f908?, 0x6e07883e080?, 0x6e07883e080?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23495 +0x95
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeFromTypeReference(0x6e07920f908, 0x6e07883e080)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23355 +0x117
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeFromTypeNodeWorker(0xec8b40?, 0x6e079a50b28?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23198 +0x37f
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeFromTypeNode(0x6e07920f908, 0x6e07883e080)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23149 +0x1d
github.com/microsoft/TypeScript/tsc/internal/core.Map[...](...)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/core/core.go:86
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeFromUnionTypeNode(0x6e07920f908, 0x6e07882c150)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:24563 +0x1b7
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeFromTypeNodeWorker(0x6e07920f908, 0x895885?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23211 +0x289
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeFromTypeNode(0x6e07920f908, 0x6e07882c150)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:23149 +0x1d
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getQuickTypeOfExpression(0x6e07920f908, 0x6e07882e1c0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:7545 +0x145
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).checkDeclarationInitializer(0x6e07920f908, 0x6e07882c1c0, 0x0, 0x0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:17099 +0x3f
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeForVariableLikeDeclaration(0x6e07920f908, 0x6e07882c1c0, 0x1?, 0x0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:17049 +0x767
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getWidenedTypeForVariableLikeDeclaration(0x6e07920f908, 0x6e07882c1c0, 0x1)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:16948 +0x28
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeOfVariableOrParameterOrPropertyWorker(0x6e07920f908, 0x6e078927cc8)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:16910 +0x27a
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeOfVariableOrParameterOrProperty(0x6e07920f908, 0x6e078927cc8)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:16847 +0x4d
github.com/microsoft/TypeScript/tsc/internal/checker.(*Checker).getTypeOfSymbol(0x939d07?, 0x1fbe1d0?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/checker.go:16810 +0x9b
github.com/microsoft/TypeScript/tsc/internal/checker.(*NodeBuilderImpl).serializeTypeForDeclaration(0x6e078b0ee80, 0x6e0788261b0?, 0x800081c0d?, 0x15e75d0?, 0x1)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/nodebuilderimpl.go:2274 +0x265
github.com/microsoft/TypeScript/tsc/internal/checker.(*NodeBuilder).SerializeTypeForDeclaration(0x6e078c25500, 0x6e07882c1c0, 0x6e078927cc8, 0x18?, 0xed7560?, 0x0?, {0x15e75d0?, 0x6e07881f860?})
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/nodebuilder.go:136 +0x59
github.com/microsoft/TypeScript/tsc/internal/checker.(*EmitResolver).CreateTypeOfDeclaration(0x6e078c2a480, 0x6e07889e000, 0x6e07882c1c0, 0x6e0788261b0, 0x81c0d, 0x8, {0x15e75d0, 0x6e07881f860})
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/checker/emitresolver.go:985 +0x174
github.com/microsoft/TypeScript/tsc/internal/transformers/declarations.(*DeclarationTransformer).ensureType(0x6e0786b7c80, 0x6e07882c1c0, 0x28?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/declarations/transform.go:1673 +0x36a
github.com/microsoft/TypeScript/tsc/internal/transformers/declarations.(*DeclarationTransformer).transformPropertyDeclaration(0x6e0786b7c80, 0x6e07882c1c0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/declarations/transform.go:999 +0x74
github.com/microsoft/TypeScript/tsc/internal/transformers/declarations.(*DeclarationTransformer).visitDeclarationSubtree(0x6e0786b7c80, 0x6e07882c1c0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/declarations/transform.go:642 +0x805
github.com/microsoft/TypeScript/tsc/internal/transformers/declarations.(*DeclarationTransformer).visit(0x6e078905808?, 0x6e078620150?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/declarations/transform.go:272 +0xe6
github.com/microsoft/TypeScript/tsc/internal/ast.(*NodeVisitor).VisitSlice(0x6e07881f8c0, {0x6e07882e160, 0x1, 0x1})
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/ast/visitor.go:148 +0xc2
github.com/microsoft/TypeScript/tsc/internal/ast.(*NodeVisitor).VisitNodes(0x6e07881f8c0, 0x6e078832100)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/ast/visitor.go:99 +0x37
github.com/microsoft/TypeScript/tsc/internal/transformers/declarations.(*DeclarationTransformer).buildClassMembers(0x6e0786b7c80, 0x6e0788261b0, {0x0, 0x0, 0xfdbaa0?})
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/declarations/transform.go:1972 +0x454
github.com/microsoft/TypeScript/tsc/internal/transformers/declarations.(*DeclarationTransformer).transformClassDeclaration(0x6e0786b7c80, 0x6e0788261b0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/declarations/transform.go:1997 +0x20c
github.com/microsoft/TypeScript/tsc/internal/transformers/declarations.(*DeclarationTransformer).transformTopLevelDeclaration(0x6e0786b7c80, 0x6e0788261b0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/declarations/transform.go:1763 +0x4e7
github.com/microsoft/TypeScript/tsc/internal/transformers/declarations.(*DeclarationTransformer).visitDeclarationStatements(0x6e0786b7c80, 0x6e0788261b0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/declarations/transform.go:1175 +0x485
github.com/microsoft/TypeScript/tsc/internal/transformers/declarations.(*DeclarationTransformer).visit(0xf1c880?, 0x6e078832101?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/declarations/transform.go:247 +0xcb
github.com/microsoft/TypeScript/tsc/internal/ast.(*NodeVisitor).VisitSlice(0x6e07881f8c0, {0x6e07882e168, 0x3, 0x3})
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/ast/visitor.go:148 +0xc2
github.com/microsoft/TypeScript/tsc/internal/ast.(*NodeVisitor).VisitNodes(0x6e07881f8c0, 0x6e078832120)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/ast/visitor.go:99 +0x37
github.com/microsoft/TypeScript/tsc/internal/transformers/declarations.(*DeclarationTransformer).transformSourceFile(0x6e0786b7c80, 0x6e078846008)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/declarations/transform.go:353 +0x117
github.com/microsoft/TypeScript/tsc/internal/transformers/declarations.(*DeclarationTransformer).visitSourceFile(0x6e0786b7c80, 0x6e078846008)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/declarations/transform.go:305 +0x2f1
github.com/microsoft/TypeScript/tsc/internal/transformers/declarations.(*DeclarationTransformer).visit(0xb7?, 0x0?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/declarations/transform.go:232 +0xaf
github.com/microsoft/TypeScript/tsc/internal/ast.(*NodeVisitor).VisitNode(0x6e078642008?, 0x7fb340789c00?)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/ast/visitor.go:51 +0x27
github.com/microsoft/TypeScript/tsc/internal/ast.(*NodeVisitor).VisitSourceFile(...)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/ast/visitor.go:36
github.com/microsoft/TypeScript/tsc/internal/transformers.(*Transformer).TransformSourceFile(...)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/transformers/transformer.go:40
github.com/microsoft/TypeScript/tsc/internal/compiler.(*emitter).runDeclarationTransformers(0x0?, 0x0?, 0x6e078846008, {0x6e07853a180?, 0x0?}, {0x0?, 0x7?})
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/compiler/emitter.go:84 +0x278
github.com/microsoft/TypeScript/tsc/internal/compiler.(*emitter).emitDeclarationFile(0x6e0786540f0, 0x6e078846008, {0x6e07853a180, 0xb7}, {0x0, 0x0})
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/compiler/emitter.go:236 +0x218
github.com/microsoft/TypeScript/tsc/internal/compiler.(*emitter).emit(0x6e0786540f0)
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/compiler/emitter.go:51 +0x145
github.com/microsoft/TypeScript/tsc/internal/compiler.(*Program).Emit.func2()
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/compiler/program.go:1854 +0x1ce
github.com/microsoft/TypeScript/tsc/internal/core.(*parallelWorkGroup).Queue.func1()
	/home/fuzz/WorkSpace/fusion-fuzz/projects/typescript/typescript-src/tsc/internal/core/workgroup.go:40 +0x13
sync.(*WaitGroup).Go.func1()
	/usr/local/go/src/sync/waitgroup.go:258 +0x4a
created by sync.(*WaitGroup).Go in goroutine 1
	/usr/local/go/src/sync/waitgroup.go:238 +0x73