Reintroduce extern crate for non-Cargo dependencies.
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@@ -1,8 +1,8 @@
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use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
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use rustc::{declare_tool_lint, lint_array};
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use rustc::ty::{self, Ty};
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use rustc::ty::subst::Subst;
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use rustc::hir::*;
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use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
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use crate::rustc::{declare_tool_lint, lint_array};
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use crate::rustc::ty::{self, Ty};
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use crate::rustc::ty::subst::Subst;
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use crate::rustc::hir::*;
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use crate::utils::span_lint;
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/// **What it does:** Detects giving a mutable reference to a function that only
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