x/tools/gopls: slice bounds out of range - internal/lsp/cache.fixArrayType

[notchi590]

gopls version: v0.11.0 (go1.18.4)
gopls flags:
update flags: proxy
extension version: 0.38.0
go version: 1.18.4
environment: code-server linux
initialization error: undefined
issue timestamp: Tue, 07 Mar 2023 07:41:02 GMT
restart history:
Tue, 07 Mar 2023 05:37:17 GMT: activation (enabled: true)

ATTENTION: PLEASE PROVIDE THE DETAILS REQUESTED BELOW.

Describe what you observed.

panic: runtime error: slice bounds out of range [:33306] with capacity 33305

goroutine 4001 [running]:
golang.org/x/tools/gopls/internal/lsp/cache.fixArrayType(0xc005d21020, {0x10a4700, 0xc005d2ac40}, 0x0%3F, {0xc005736000, 0xc0049556e0%3F, 0x8219})
	  parse.go:996  0x31c
golang.org/x/tools/gopls/internal/lsp/cache.fixAST.func1({0x10a45c0%3F, 0xc005d21020%3F}, {0x10a4700%3F, 0xc005d2ac40})
	  parse.go:568  0x23f
golang.org/x/tools/gopls/internal/lsp/cache.walkASTWithParent.func1({0x10a45c0%3F, 0xc005d21020%3F})
	  parse.go:628  0xbe
go/ast.inspector.Visit(0xc0059e7fe0, {0x10a45c0%3F, 0xc005d21020%3F})
	  walk.go:387  0x31
go/ast.Walk({0x10a30c0%3F, 0xc0059e7fe0%3F}, {0x10a45c0%3F, 0xc005d21020%3F})
	  walk.go:52  0x62
go/ast.walkExprList({0x10a30c0, 0xc0059e7fe0}, {0xc0059f6a00%3F, 0x9, 0x50e511%3F})
	  walk.go:26  0x91
go/ast.Walk({0x10a30c0%3F, 0xc0059e7fe0%3F}, {0x10a4700%3F, 0xc005d2ac40%3F})
	  walk.go:145  0xa8b
go/ast.walkExprList({0x10a30c0, 0xc0059e7fe0}, {0xc005d18960%3F, 0x1, 0x50e511%3F})
	  walk.go:26  0x91
go/ast.Walk({0x10a30c0%3F, 0xc0059e7fe0%3F}, {0x10a4570%3F, 0xc005d2ac80%3F})
	  walk.go:218  0x1548
go/ast.walkStmtList({0x10a30c0, 0xc0059e7fe0}, {0xc0059af800%3F, 0x7, 0x10a8a70%3F})
	  walk.go:32  0x91
go/ast.Walk({0x10a30c0%3F, 0xc0059e7fe0%3F}, {0x10a46b0%3F, 0xc005d11ec0%3F})
	  walk.go:235  0x10e5
go/ast.Walk({0x10a30c0%3F, 0xc0059e7fe0%3F}, {0x10a4a20%3F, 0xc005d18970%3F})
	  walk.go:100  0x1c36
go/ast.Walk({0x10a30c0%3F, 0xc0059e7fe0%3F}, {0x10a4700%3F, 0xc005d2ad00%3F})
	  walk.go:144  0xa65
go/ast.Walk({0x10a30c0%3F, 0xc0059e7fe0%3F}, {0x10a4a98%3F, 0xc005d18080%3F})
	  walk.go:221  0x695
go/ast.walkStmtList({0x10a30c0, 0xc0059e7fe0}, {0xc0059fd280%3F, 0x3, 0xc005d16be0%3F})
	  walk.go:32  0x91
go/ast.Walk({0x10a30c0%3F, 0xc0059e7fe0%3F}, {0x10a46b0%3F, 0xc0059fa900%3F})
	  walk.go:235  0x10e5
go/ast.Inspect(...)
	  walk.go:399
golang.org/x/tools/gopls/internal/lsp/cache.walkASTWithParent({0x10a46b0%3F, 0xc0059fa900%3F}, 0xc005d16be0%3F)
	  parse.go:611  0xac
golang.org/x/tools/gopls/internal/lsp/cache.fixAST({0x10a8a70%3F, 0xc0049556e0}, {0x10a46b0, 0xc0059fa900}, 0xc00527c240, {0xc005736000, 0x8219, 0x8219})
	  parse.go:557  0x147
golang.org/x/tools/gopls/internal/lsp/cache.fixAST.func1({0x10a45e8%3F, 0xc0059d9210%3F}, {0x10a46b0%3F, 0xc0059fa900})
	  parse.go:562  0x1af
golang.org/x/tools/gopls/internal/lsp/cache.walkASTWithParent.func1({0x10a45e8%3F, 0xc0059d9210%3F})
	  parse.go:628  0xbe
go/ast.inspector.Visit(0xc0059e76c8, {0x10a45e8%3F, 0xc0059d9210%3F})
	  walk.go:387  0x31
go/ast.Walk({0x10a30c0%3F, 0xc0059e76c8%3F}, {0x10a45e8%3F, 0xc0059d9210%3F})
	  walk.go:52  0x62
go/ast.walkStmtList({0x10a30c0, 0xc0059e76c8}, {0xc0059fd280%3F, 0x3, 0x10a8a70%3F})
	  walk.go:32  0x91
go/ast.Walk({0x10a30c0%3F, 0xc0059e76c8%3F}, {0x10a46b0%3F, 0xc0059fa900%3F})
	  walk.go:235  0x10e5
go/ast.Walk({0x10a30c0%3F, 0xc0059e76c8%3F}, {0x10a49f8%3F, 0xc0059fa930%3F})
	  walk.go:358  0x4b0
go/ast.walkDeclList({0x10a30c0, 0xc0059e76c8}, {0xc0059f6500%3F, 0x9, 0xc005d16410%3F})
	  walk.go:38  0x91
go/ast.Walk({0x10a30c0%3F, 0xc0059e76c8%3F}, {0x10a49a8%3F, 0xc0059af680%3F})
	  walk.go:367  0x1890
go/ast.Inspect(...)
	  walk.go:399
golang.org/x/tools/gopls/internal/lsp/cache.walkASTWithParent({0x10a49a8%3F, 0xc0059af680%3F}, 0xc005d16410%3F)
	  parse.go:611  0xac
golang.org/x/tools/gopls/internal/lsp/cache.fixAST({0x10a8a70%3F, 0xc0049556e0}, {0x10a49a8, 0xc0059af680}, 0xc00527c240, {0xc005736000, 0x8219, 0x8219})
	  parse.go:557  0x147
golang.org/x/tools/gopls/internal/lsp/cache.parseGoImpl({0x10a89c8, 0xc00497a6c0}, 0xd37c80%3F, {0x10a8cd8, 0xc0002783f0}, 0x2)
	  parse.go:195  0x9a5
golang.org/x/tools/gopls/internal/lsp/cache.(*snapshot).ParseGo.func1({0x10a89c8%3F, 0xc00497a6c0%3F}, {0xe1de80%3F, 0xc0030e4b00%3F})
	  parse.go:63  0x59
golang.org/x/tools/internal/memoize.(*Promise).run.func2.1()
	  memoize.go:187  0xa9
runtime/trace.WithRegion({0x10a89c8%3F, 0xc00497a6c0%3F}, {0xc0049568c0, 0x1a}, 0xc00012cf90)
	  annotation.go:141  0xe3
golang.org/x/tools/internal/memoize.(*Promise).run.func2()
	  memoize.go:180  0x145
created by golang.org/x/tools/internal/memoize.(*Promise).run
	  memoize.go:179  0x1d0
[Error - 4:40:49 PM] 

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[adonovan]

The file has since changed but this is the failing operation in v0.11.0:

https://cs.opensource.google/go/x/tools/+/refs/tags/gopls/v0.11.0:gopls/internal/lsp/cache/parse.go;l=996