gopls version: v0.8.0-pre.2
gopls flags:
update flags: proxy
extension version: 2022.2.1423
go version: 1.18beta2
environment: Visual Studio Code darwin
initialization error: undefined
issue timestamp: Sun, 20 Feb 2022 01:22:52 GMT
restart history:
Sun, 20 Feb 2022 00:43:53 GMT: activation (enabled: true)

ATTENTION: PLEASE PROVIDE THE DETAILS REQUESTED BELOW.

Describe what you observed.

panic: 2229938: duplicate method Contains

goroutine 995 [running]:
go/types.(*Checker).handleBailout(0xc002f50000, 0xc00179d650)
	  check.go:304  0x8b
panic({0x186bf00, 0xc001e97990})
	  panic.go:838  0x207
go/types.computeInterfaceTypeSet.func2(0x2206b2, 0xc002622280, 0x1)
	  typeset.go:233  0x5bd
go/types.computeInterfaceTypeSet(0x0, 0x18cbec0%3F, 0xc0020170e0)
	  typeset.go:260  0x2d5
go/types.(*Interface).typeSet(...)
	  interface.go:29
go/types.(*Interface).Empty(0x1bf2dc0%3F)
	  interface.go:111  0x25
go/types.(*Checker).implements(0xc002f50000, {0x1bf2de8%3F, 0xc001e97590}, {0x1bf2dc0%3F, 0xc000543730})
	  instantiate.go:187  0x485
go/types.(*operand).assignableTo(0xc002a98600, 0xc002f50000, {0x1bf2dc0%3F, 0xc000543730%3F}, 0xc00179bbf0)
	  operand.go:283  0x9c5
go/types.(*Checker).assignment(0xc002f50000, 0xc002a98600, {0x1bf2dc0, 0xc000543730}, {0xc0010e0e70, 0x18})
	  assignments.go:87  0x80b
go/types.(*Checker).arguments(0xc002f50000, 0xc001f05dc0, 0xc002a985c0, {0x0, 0x0, 0x0}, {0xc001f864a0%3F, 0x1, 0x1}, {0x0, ...})
	  call.go:414  0xbf4
go/types.(*Checker).callExpr(0xc002f50000, 0xc002a98500, 0xc001f05dc0)
	  call.go:210  0x669
go/types.(*Checker).exprInternal(0xc002f50000, 0xc002a98500, {0x1bf4e30%3F, 0xc001f05dc0}, {0x0%3F, 0x0%3F})
	  expr.go:1483  0x9f2
go/types.(*Checker).rawExpr(0xc002f50000%3F, 0x1bf0f20%3F, {0x1bf4e30%3F, 0xc001f05dc0%3F}, {0x0%3F, 0x0%3F}, 0x0)
	  expr.go:1111  0x45
go/types.(*Checker).stmt(0xc002f50000, 0x0, {0x1bf4fe0%3F, 0xc00229dec0%3F})
	  stmt.go:394  0x247c
go/types.(*Checker).stmtList(0xc002f50000%3F, 0x0, {0xc0007e6400%3F, 0x0%3F, 0xc0007f8800%3F})
	  stmt.go:125  0xc9
go/types.(*Checker).funcBody(0xc002f50000, 0xc002f33b00, {0x1bf2d70%3F, 0xc001762b88%3F}, 0xc002066b80, 0xc0021022a0, {0x0, 0x0})
	  stmt.go:46  0x285
go/types.(*Checker).funcDecl.func1()
	  decl.go:790  0x45
go/types.(*Checker).processDelayed(0xc002f50000, 0x0)
	  check.go:375  0x39
go/types.(*Checker).checkFiles(0xc002f50000, {0xc0016386e0%3F, 0xc002f08f00%3F, 0x0%3F})
	  check.go:326  0xcb
go/types.(*Checker).Files(...)
	  check.go:309
golang.org/x/tools/internal/lsp/cache.doTypeCheck({0x1bf64e0, 0xc001f05300}, 0xc00036b560, 0xc00081de00, 0x2, 0xc001014ae0, 0x19a8093%3F)
	  check.go:548  0x97b
golang.org/x/tools/internal/lsp/cache.typeCheck({0x1bf64e0, 0xc001f05300}, 0xc00036b560, 0xc00081de00, 0x2, 0xc001014ae0%3F)
	  check.go:314  0xe5
golang.org/x/tools/internal/lsp/cache.(*snapshot).buildPackageHandle.func1({0x1bf64e0%3F, 0xc001f05300}, {0x1befd00%3F, 0xc00036b560})
	  check.go:125  0x233
golang.org/x/tools/internal/memoize.(*Handle).run.func1()
	  memoize.go:327  0xa9
created by golang.org/x/tools/internal/memoize.(*Handle).run
	  memoize.go:320  0x1b8
[Error - 9:22:28 AM] 

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