x/tools/gopls: impossible crash in (*types.Checker).basicLit

[adonovan]

#!stacks
"sigpanic" && "go/types.(*Checker).basicLit:+1"

Issue created by stacks.

The BasicLit pointer is nil or invalid.

This stack 84VhpQ was reported by telemetry:

• crash/crash
• runtime.throw:+9,+0x47
• runtime.sigpanic:+33,+0x26b
• go/types.(*Checker).basicLit:+1,+0x2f
• go/types.(*Checker).exprInternal:+19,+0x19e
• go/types.(*Checker).rawExpr:+10,+0x18b
• go/types.(*Checker).expr:+1,+0x2f
• go/types.(*Checker).binary:+4,+0xcb
• go/types.(*Checker).exprInternal:+134,+0x8e4
• go/types.(*Checker).rawExpr:+10,+0x18b
• go/types.(*Checker).expr:+1,+0x2f
• go/types.(*Checker).stmt:+200,+0x10ce
• go/types.(*Checker).stmtList:+9,+0x84
• go/types.(*Checker).funcBody:+24,+0x310
• go/types.(*Checker).funcDecl.func1:+1,+0x39
• go/types.(*Checker).processDelayed:+18,+0x1e1
• go/types.(*Checker).checkFiles:+32,+0x2f8

golang.org/x/tools/gopls@v0.20.0 go1.25.0 linux/amd64 gopls.client=vscode (1)

Use this command to reproduce the executable:
(HOME=$(mktemp -d); GOOS=linux GOARCH=amd64 GOTOOLCHAIN=go1.25.0 go install golang.org/x/tools/gopls@v0.20.0 && find $HOME/go/bin -type f)
To disassemble: go tool objdump exe | less

[gabyhelp]

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• x/tools/gopls: CodeAction: nil deref crash in "extract variable" (ast.Inspect of nil FuncDecl.Body) #76235 (closed)
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