On macOS, when go.toolsGopath is set (and different from GOPATH), Debugger fails to start

[ExcChua]

• VSCode Version: 1.28.1
• OS Version: macOS 10.13.6 (17G65)

Error: Failed to continue: "Cannot find Delve debugger. Install from https://github.com/derekparker/delve & ensure it is in your "GOPATH/bin" or "PATH"."

Steps to Reproduce:

1. Set go.toolsGopath in User Settings (not Workspace settings) to a new location.
2. Install Go Tools to go.toolsGopath using Command Palette, "Go: Install/Update Tools" and install all tools.
3. Start a new Go project, and attempt to debug.

Does this issue occur when all extensions are disabled?: This question does not apply, because if all extensions are disabled, Go cannot be used in VS Code.

[vscodebot]

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Happy Coding!