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DaveHasteSpringer opened this issue Nov 16, 2021 · 5 comments
Closed

Compiler panics when building golang.org/x/sync/singleflight #1088

DaveHasteSpringer opened this issue Nov 16, 2021 · 5 comments
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@nevkontakte
Labels
bug duplicate
Milestone
Go spec compliance

Comments

@DaveHasteSpringer
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Recent versions of golang.org/x/sync/singleflight cause a panic in the gopherjs compiler.

These are the versions of Go and GopherJS that I'm using:

$ go version
go version go1.17.2 darwin/amd64

$ gopherjs version
GopherJS 1.17.1+go1.17.3

This is the most concise test code I can use to reproduce the problem:

package main

import "golang.org/x/sync/singleflight"

func main() {
	var group singleflight.Group

	group.Do("key", func() (interface{}, error) {
		return nil, nil
	})
}

This is my go.mod file:

module gopherjs-test

go 1.17

require golang.org/x/sync v0.0.0-20210220032951-036812b2e83c

The code builds fine with the go compiler:

$ go build test.go
$ echo $?
0

However the GopherJS compiler panics:

$ gopherjs build test.go
[compiler panic]  Unhandled object: *types.Builtin


 Occurred while compiling statement at /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:162:5:
     0  *ast.GoStmt {
     1  .  Go: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:162:5
     2  .  Call: *ast.CallExpr {
     3  .  .  Fun: *ast.Ident {
     4  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:162:8
     5  .  .  .  Name: "panic"
     6  .  .  }
     7  .  .  Lparen: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:162:13
     8  .  .  Args: []ast.Expr (len = 1) {
     9  .  .  .  0: *ast.Ident {
    10  .  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:162:14
    11  .  .  .  .  Name: "e"
    12  .  .  .  .  Obj: *ast.Object {
    13  .  .  .  .  .  Kind: var
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    15  .  .  .  .  .  Decl: *ast.AssignStmt {
    16  .  .  .  .  .  .  Lhs: []ast.Expr (len = 2) {
    17  .  .  .  .  .  .  .  0: *ast.Ident {
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    19  .  .  .  .  .  .  .  .  Name: "e"
    20  .  .  .  .  .  .  .  .  Obj: *(obj @ 12)
    21  .  .  .  .  .  .  .  }
    22  .  .  .  .  .  .  .  1: *ast.Ident {
    23  .  .  .  .  .  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:158:9
    24  .  .  .  .  .  .  .  .  Name: "ok"
    25  .  .  .  .  .  .  .  .  Obj: *ast.Object {
    26  .  .  .  .  .  .  .  .  .  Kind: var
    27  .  .  .  .  .  .  .  .  .  Name: "ok"
    28  .  .  .  .  .  .  .  .  .  Decl: *(obj @ 15)
    29  .  .  .  .  .  .  .  .  }
    30  .  .  .  .  .  .  .  }
    31  .  .  .  .  .  .  }
    32  .  .  .  .  .  .  TokPos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:158:12
    33  .  .  .  .  .  .  Tok: :=
    34  .  .  .  .  .  .  Rhs: []ast.Expr (len = 1) {
    35  .  .  .  .  .  .  .  0: *ast.TypeAssertExpr {
    36  .  .  .  .  .  .  .  .  X: *ast.SelectorExpr {
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    39  .  .  .  .  .  .  .  .  .  .  Name: "c"
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    42  .  .  .  .  .  .  .  .  .  .  .  Name: "c"
    43  .  .  .  .  .  .  .  .  .  .  .  Decl: *ast.Field {
    44  .  .  .  .  .  .  .  .  .  .  .  .  Names: []*ast.Ident (len = 1) {
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    47  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "c"
    48  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Obj: *(obj @ 40)
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    53  .  .  .  .  .  .  .  .  .  .  .  .  .  X: *ast.Ident {
    54  .  .  .  .  .  .  .  .  .  .  .  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:139:27
    55  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "call"
    56  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Obj: *ast.Object {
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    59  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Decl: *ast.TypeSpec {
    60  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: *ast.Ident {
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    62  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "call"
    63  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Obj: *(obj @ 56)
    64  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
    65  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Assign: -
    66  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Type: *ast.StructType {
    67  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Struct: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:47:11
    68  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Fields: *ast.FieldList {
    69  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Opening: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:47:18
    70  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  List: []*ast.Field (len = 6) {
    71  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  0: *ast.Field {
    72  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Names: []*ast.Ident (len = 1) {
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    74  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:48:2
    75  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "wg"
    76  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Obj: *ast.Object {
    77  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Kind: var
    78  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "wg"
    79  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Decl: *(obj @ 71)
    80  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
    81  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
    82  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
    83  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Type: *ast.SelectorExpr {
    84  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  X: *ast.Ident {
    85  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:48:5
    86  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "sync"
    87  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
    88  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Sel: *ast.Ident {
    89  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:48:10
    90  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "WaitGroup"
    91  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
    92  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
    93  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
    94  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1: *ast.Field {
    95  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Doc: *ast.CommentGroup {
    96  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  List: []*ast.Comment (len = 2) {
    97  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  0: *ast.Comment {
    98  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Slash: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:50:2
    99  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Text: "// These fields are written once before the WaitGroup is done"
   100  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   101  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1: *ast.Comment {
   102  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Slash: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:51:2
   103  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Text: "// and are only read after the WaitGroup is done."
   104  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   105  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   106  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   107  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Names: []*ast.Ident (len = 1) {
   108  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  0: *ast.Ident {
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   110  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "val"
   111  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Obj: *ast.Object {
   112  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Kind: var
   113  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "val"
   114  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Decl: *(obj @ 94)
   115  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   116  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   117  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   118  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Type: *ast.InterfaceType {
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   120  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Methods: *ast.FieldList {
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   122  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Closing: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:52:16
   123  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   124  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Incomplete: false
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   135  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Decl: *(obj @ 127)
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   138  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   139  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Type: *ast.Ident {
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   141  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "error"
   142  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   143  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   144  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3: *ast.Field {
   145  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Doc: *ast.CommentGroup {
   146  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  List: []*ast.Comment (len = 2) {
   147  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  0: *ast.Comment {
   148  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Slash: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:55:2
   149  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Text: "// forgotten indicates whether Forget was called with this call's key"
   150  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
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   153  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Text: "// while the call was still in flight."
   154  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   155  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   156  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
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   160  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "forgotten"
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   170  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "bool"
   171  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   172  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   173  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  4: *ast.Field {
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   178  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Text: "// These fields are read and written with the singleflight"
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   180  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1: *ast.Comment {
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   182  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Text: "// mutex held before the WaitGroup is done, and are read but"
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   184  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  2: *ast.Comment {
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   186  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Text: "// not written after the WaitGroup is done."
   187  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   188  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   189  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   190  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Names: []*ast.Ident (len = 1) {
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   193  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "dups"
   194  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Obj: *ast.Object {
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   197  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Decl: *(obj @ 173)
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   203  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "int"
   204  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   205  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   206  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  5: *ast.Field {
   207  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Names: []*ast.Ident (len = 1) {
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   217  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
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   220  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Elt: *ast.ChanType {
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   226  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "Result"
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   233  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "Result"
   234  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Obj: *(obj @ 227)
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   241  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  List: []*ast.Field (len = 3) {
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   247  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Obj: *ast.Object {
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   250  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Decl: *(obj @ 242)
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   252  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   253  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   254  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Type: *ast.InterfaceType {
   255  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Interface: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:76:9
   256  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Methods: *ast.FieldList {
   257  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Opening: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:76:18
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   300  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Incomplete: false
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   302  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
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   306  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   307  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   308  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   309  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Closing: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:64:1
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   311  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Incomplete: false
   312  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   313  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   314  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   315  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   316  .  .  .  .  .  .  .  .  .  .  .  .  }
   317  .  .  .  .  .  .  .  .  .  .  .  }
   318  .  .  .  .  .  .  .  .  .  .  }
   319  .  .  .  .  .  .  .  .  .  }
   320  .  .  .  .  .  .  .  .  .  Sel: *ast.Ident {
   321  .  .  .  .  .  .  .  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:158:17
   322  .  .  .  .  .  .  .  .  .  .  Name: "err"
   323  .  .  .  .  .  .  .  .  .  }
   324  .  .  .  .  .  .  .  .  }
   325  .  .  .  .  .  .  .  .  Lparen: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:158:21
   326  .  .  .  .  .  .  .  .  Type: *ast.StarExpr {
   327  .  .  .  .  .  .  .  .  .  Star: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:158:22
   328  .  .  .  .  .  .  .  .  .  X: *ast.Ident {
   329  .  .  .  .  .  .  .  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:158:23
   330  .  .  .  .  .  .  .  .  .  .  Name: "panicError"
   331  .  .  .  .  .  .  .  .  .  .  Obj: *ast.Object {
   332  .  .  .  .  .  .  .  .  .  .  .  Kind: type
   333  .  .  .  .  .  .  .  .  .  .  .  Name: "panicError"
   334  .  .  .  .  .  .  .  .  .  .  .  Decl: *ast.TypeSpec {
   335  .  .  .  .  .  .  .  .  .  .  .  .  Name: *ast.Ident {
   336  .  .  .  .  .  .  .  .  .  .  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:24:6
   337  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "panicError"
   338  .  .  .  .  .  .  .  .  .  .  .  .  .  Obj: *(obj @ 331)
   339  .  .  .  .  .  .  .  .  .  .  .  .  }
   340  .  .  .  .  .  .  .  .  .  .  .  .  Assign: -
   341  .  .  .  .  .  .  .  .  .  .  .  .  Type: *ast.StructType {
   342  .  .  .  .  .  .  .  .  .  .  .  .  .  Struct: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:24:17
   343  .  .  .  .  .  .  .  .  .  .  .  .  .  Fields: *ast.FieldList {
   344  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Opening: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:24:24
   345  .  .  .  .  .  .  .  .  .  .  .  .  .  .  List: []*ast.Field (len = 2) {
   346  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  0: *ast.Field {
   347  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Names: []*ast.Ident (len = 1) {
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   349  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:25:2
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   351  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Obj: *ast.Object {
   352  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Kind: var
   353  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "value"
   354  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Decl: *(obj @ 346)
   355  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   356  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   357  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   358  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Type: *ast.InterfaceType {
   359  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Interface: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:25:8
   360  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Methods: *ast.FieldList {
   361  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Opening: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:25:17
   362  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Closing: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:25:18
   363  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   364  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Incomplete: false
   365  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   366  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   367  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1: *ast.Field {
   368  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Names: []*ast.Ident (len = 1) {
   369  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  0: *ast.Ident {
   370  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:26:2
   371  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Name: "stack"
   372  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Obj: *ast.Object {
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   378  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   379  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Type: *ast.ArrayType {
   380  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Lbrack: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:26:8
   381  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Elt: *ast.Ident {
   382  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  NamePos: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:26:10
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   384  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   385  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   386  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   387  .  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   388  .  .  .  .  .  .  .  .  .  .  .  .  .  .  Closing: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:27:1
   389  .  .  .  .  .  .  .  .  .  .  .  .  .  }
   390  .  .  .  .  .  .  .  .  .  .  .  .  .  Incomplete: false
   391  .  .  .  .  .  .  .  .  .  .  .  .  }
   392  .  .  .  .  .  .  .  .  .  .  .  }
   393  .  .  .  .  .  .  .  .  .  .  }
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   395  .  .  .  .  .  .  .  .  }
   396  .  .  .  .  .  .  .  .  Rparen: /Users/hast02/code/go/pkg/mod/golang.org/x/[email protected]/singleflight/singleflight.go:158:33
   397  .  .  .  .  .  .  .  }
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   403  .  .  Ellipsis: -
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   405  .  }
   406  }


 goroutine 1 [running]:
runtime/debug.Stack()
	/usr/local/Cellar/go/1.17.2/libexec/src/runtime/debug/stack.go:24 +0x65
github.com/gopherjs/gopherjs/compiler.bailout(...)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/utils.go:807
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateStmt.func1()
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:36 +0x7f
panic({0x1494c60, 0xc000e31e50})
	/usr/local/Cellar/go/1.17.2/libexec/src/runtime/panic.go:1047 +0x266
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateExpr(0xc00069a210, {0x16125e0, 0xc000cf14e0})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/expressions.go:767 +0x76d4
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateStmt(0xc00069a210, {0x16125b0, 0xc000df8010}, 0x0)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:499 +0x36a5
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateStmtList(0xc00069a210, {0xc000de4300, 0x2, 0xb})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:19 +0x79
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateBranchingStmt.func2()
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:646 +0x6a
github.com/gopherjs/gopherjs/compiler.(*funcContext).Indent(...)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/utils.go:61
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateBranchingStmt(0xc00069a210, {0xc0006897c8, 0x0, 0x1}, 0xc000df7800, 0xa0, 0xc001162a00, 0x0, 0x1)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:645 +0x88e
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateStmt(0xc00069a210, {0x1612610, 0xc000df6200}, 0x0)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:73 +0x62ad
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateStmtList(0xc00069a210, {0xc000df8080, 0x1, 0xb})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:19 +0x79
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateBranchingStmt.func2()
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:646 +0x6a
github.com/gopherjs/gopherjs/compiler.(*funcContext).Indent(...)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/utils.go:61
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateBranchingStmt(0xc00069a210, {0xc000e31c70, 0x2, 0x2}, 0xc000df7780, 0x1, 0xc0011635b8, 0x0, 0x1)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:645 +0x88e
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateStmt(0xc00069a210, {0x1612610, 0xc000df62c0}, 0x0)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:73 +0x62ad
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateStmtList(0xc00069a210, {0xc000de4320, 0x2, 0x1})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:19 +0x79
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateStmt(0xc00069a210, {0x1612280, 0xc000dd33e0}, 0x0)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:53 +0x3f8
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateStmtList(0xc00069a210, {0xc000da6f80, 0x6, 0xc000dfd5f0})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:19 +0x79
github.com/gopherjs/gopherjs/compiler.translateFunction.func1()
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/package.go:771 +0x30b
github.com/gopherjs/gopherjs/compiler.(*funcContext).CatchOutput(0xc00069a210, 0x1, 0x1528fa1)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/utils.go:69 +0x78
github.com/gopherjs/gopherjs/compiler.translateFunction(0xc000704d08, 0x0, 0xc000dd3680, 0xc00069a0b0, 0xc00079aa20, 0xc000da7700, {0x0, 0x0})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/package.go:746 +0x4ba
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateExpr(0xc00069a0b0, {0x1612520, 0xc000df80d0})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/expressions.go:180 +0x4775
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateStmt(0xc00069a0b0, {0x1612400, 0xc000df80e0}, 0x0)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:403 +0x73d
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateStmtList(0xc00069a0b0, {0xc000da7000, 0x5, 0xc001166a58})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/statements.go:19 +0x79
github.com/gopherjs/gopherjs/compiler.translateFunction.func1()
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/package.go:771 +0x30b
github.com/gopherjs/gopherjs/compiler.(*funcContext).CatchOutput(0xc00069a0b0, 0x1, 0xc000db8640)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/utils.go:69 +0x78
github.com/gopherjs/gopherjs/compiler.translateFunction(0xc000705158, 0xc000cf0d60, 0xc000dd3800, 0xc0000fbb80, 0xc0007876e0, 0xc000da7600, {0xc000e03320, 0x1a})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/package.go:746 +0x4ba
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateToplevelFunction.func1({0xc000e03320, 0x1a})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/package.go:658 +0x79
github.com/gopherjs/gopherjs/compiler.(*funcContext).translateToplevelFunction(0xc0000fbb80, 0xc000dd3830, 0xc000da7600)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/package.go:687 +0x30c
github.com/gopherjs/gopherjs/compiler.Compile.func9()
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/package.go:434 +0x31
github.com/gopherjs/gopherjs/compiler.Compile.func5(0xc001167928)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/package.go:322 +0x7e
github.com/gopherjs/gopherjs/compiler.Compile({0xc00023e060, 0x1e}, {0xc000289e58, 0x2f918a00, 0x1}, 0xc0010b6c80, 0xc000a64a00, 0x0)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/package.go:433 +0x27d2
github.com/gopherjs/gopherjs/build.(*Session).BuildPackage(0xc000020e10, 0xc000228500)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/build/build.go:695 +0x3a9
github.com/gopherjs/gopherjs/build.(*Session).buildImportPathWithSrcDir(0xc000020e10, {0xc000024101, 0xc000024101}, {0xc000024080, 0x146781e})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/build/build.go:583 +0xca
github.com/gopherjs/gopherjs/build.(*Session).BuildPackage.func1({0xc000024101, 0x1e})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/build/build.go:687 +0x85
github.com/gopherjs/gopherjs/compiler.packageImporter.Import({0xc0000625c0, 0xc0000625d0}, {0xc000024101, 0xc0000625f0})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/package.go:112 +0x6b
go/types.(*Checker).importPackage(0xc00022c140, {0x16080c0, 0xc00006c3a0}, {0xc000024101, 0x1e}, {0xc00002a300, 0x20})
	/usr/local/Cellar/go/1.17.2/libexec/src/go/types/resolver.go:162 +0x265
go/types.(*Checker).collectObjects.func1({0x1609160, 0xc000020fc0})
	/usr/local/Cellar/go/1.17.2/libexec/src/go/types/resolver.go:262 +0xb11
go/types.(*Checker).walkDecl(0x800000000000, {0x1612580, 0xc000032580}, 0xc001168940)
	/usr/local/Cellar/go/1.17.2/libexec/src/go/types/decl.go:431 +0x1c7
go/types.(*Checker).walkDecls(0xc00002a300, {0xc00006c580, 0x2, 0xc00020aea0}, 0x1528563)
	/usr/local/Cellar/go/1.17.2/libexec/src/go/types/decl.go:418 +0x6a
go/types.(*Checker).collectObjects(0xc00022c140)
	/usr/local/Cellar/go/1.17.2/libexec/src/go/types/resolver.go:252 +0x225
go/types.(*Checker).checkFiles(0xc00022c140, {0xc000010128, 0xc000228280, 0x0})
	/usr/local/Cellar/go/1.17.2/libexec/src/go/types/check.go:263 +0xb5
go/types.(*Checker).Files(...)
	/usr/local/Cellar/go/1.17.2/libexec/src/go/types/check.go:250
go/types.(*Config).Check(0x1609040, {0x1528560, 0x4}, 0xc000208380, {0xc000010128, 0x1, 0x1}, 0xc000206bb0)
	/usr/local/Cellar/go/1.17.2/libexec/src/go/types/api.go:296 +0x85
github.com/gopherjs/gopherjs/compiler.Compile({0x1528560, 0x4}, {0xc000010128, 0x0, 0x1}, 0xc000032540, 0xc0000625c0, 0x0)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/compiler/package.go:179 +0x73d
github.com/gopherjs/gopherjs/build.(*Session).BuildPackage(0xc000020e10, 0xc000228050)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/build/build.go:695 +0x3a9
github.com/gopherjs/gopherjs/build.(*Session).BuildFiles(0xc000020e10, {0xc000062400, 0x1, 0x15280c4}, {0xc0000262e8, 0x7}, {0xc000024080, 0x20})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/build/build.go:559 +0x3c8
main.main.func1.1({0xc000062400, 0x1, 0x1}, 0xc000062190, 0xc000020e10, 0xc000032280)
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/tool.go:125 +0x5a5
main.main.func1(0xc000210000, {0xc000062400, 0x1, 0x1})
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/tool.go:164 +0x174
github.com/spf13/cobra.(*Command).execute(0xc000210000, {0xc0000623d0, 0x1, 0x1})
	/Users/hast02/code/go/pkg/mod/github.com/spf13/[email protected]/command.go:860 +0x5f8
github.com/spf13/cobra.(*Command).ExecuteC(0xc000211400)
	/Users/hast02/code/go/pkg/mod/github.com/spf13/[email protected]/command.go:974 +0x3bc
github.com/spf13/cobra.(*Command).Execute(...)
	/Users/hast02/code/go/pkg/mod/github.com/spf13/[email protected]/command.go:902
main.main()
	/Users/hast02/code/go/pkg/mod/github.com/gopherjs/[email protected]/tool.go:586 +0x10b8

$ echo $?
1

From what I can tell, this is the line that provokes the GopherJS compiler panic: https://cs.opensource.google/go/x/sync/+/036812b2:singleflight/singleflight.go;l=162
@DaveHasteSpringer
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DaveHasteSpringer commented Nov 16, 2021 •
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As a workaround, it seems that changing go panic(e) to go func() { panic(e) }() in the singleflight library avoids the compiler panic.

(However, that's an awkward workaround; from a dependency-management perspective it would be preferable to use the upstream singleflight library directly, without having to adulterate it.)

@nevkontakte
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@DaveHasteSpringer thanks for the report. Looks like the compiler doesn't expect the body of a goroutine to be a built-in function (such as panic), and this is indeed an odd way to write code. However, this is definitely a bug and I'll see of I can make a fix for it.

@nevkontakte nevkontakte self-assigned this Nov 21, 2021
@nevkontakte nevkontakte added this to the Go spec compliance milestone Nov 21, 2021
@nevkontakte
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There's another flavor of the same bug:

func TestGoroutineJsObject(t *testing.T) {
	o := js.Global.Get("Object").New()
	go o.Set("x", "y") // TypeError: Cannot read property 'apply' of undefined
}

The root cause of the bug is similar: certain methods of js.Object type are normally compiled into JS expressions other than function calls, but it doesn't happen in conjunction with the go keyword.

A similar bug was fixed for defer here: #998.

@nevkontakte
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Looks like this issue has been reported earlier: #547. I'm going to close this one in favor of the older one and continue there.

@nevkontakte nevkontakte mentioned this issue Nov 21, 2021
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@DaveHasteSpringer
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@nevkontakte Ah yes, that does look like the same type of issue. Thanks for looking into it.

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