x/tools/gopls: ChangeSignature: OOB panic in inlineCall (FuncType.Params inconsistent with Signature)

[adonovan]

#!stacks
"goPanicIndex" && "inline.(*state).inlineCall:+341"

Issue created by stacks.

Likely an ill-typed input:

		var types []ast.Expr
		for _, field := range calleeDecl.Type.Params.List {
			if field.Names == nil {
				types = append(types, field.Type)
			} else {
				for range field.Names {
					types = append(types, field.Type)
				}
			}
		}

		for i := 0; i < sig.Params().Len(); i++ {
			params = append(params, &parameter{
				obj:       sig.Params().At(i),
				fieldType: types[i], <------- panic
				info:      callee.Params[len(params)],
			})
		}

(Similar to #73913, but a distinct crash.)

This stack kWCXUg was reported by telemetry:

• crash/crash
• runtime.gopanic:+69
• runtime.goPanicIndex:+2
• golang.org/x/tools/internal/refactor/inline.(*state).inlineCall:+341
• golang.org/x/tools/internal/refactor/inline.(*state).inline:+17
• golang.org/x/tools/internal/refactor/inline.Inline:+13
• golang.org/x/tools/gopls/internal/golang.inlineAllCalls:+171
• golang.org/x/tools/gopls/internal/golang.rewriteCalls:+118
• golang.org/x/tools/gopls/internal/golang.ChangeSignature:+142
• golang.org/x/tools/gopls/internal/server.(*commandHandler).ChangeSignature.func1:+15
• golang.org/x/tools/gopls/internal/server.(*commandHandler).run.func2:+3
• golang.org/x/tools/gopls/internal/server.(*commandHandler).run:+81
• golang.org/x/tools/gopls/internal/server.(*commandHandler).ChangeSignature:+2
• golang.org/x/tools/gopls/internal/protocol/command.Dispatch:+45
• golang.org/x/tools/gopls/internal/server.(*server).ResolveCodeAction:+21
• golang.org/x/tools/gopls/internal/protocol.serverDispatch:+46
• golang.org/x/tools/gopls/internal/lsprpc.(*streamServer).ServeStream.ServerHandler.func3:+5

golang.org/x/tools/gopls@v0.18.1 go1.24.0 darwin/arm64 neovim,vscode (1)