Static DUPLICATE_TOOLS 

pub static DUPLICATE_TOOLS: &'static Lint

The duplicate_tools lint detects duplicate tools found in crate-level register_tool attributes (including register_attribute_tool or register_lint_tool).

Example

#![feature(register_tool)]
#![register_tool(foo)]
#![register_tool(foo)]

{{produces}}

Explanation

Enabling a tool more than once is a no-op. To avoid this warning, remove the second register_tool() attribute.