test for #37290 using lint
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// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// This flag is needed for plugins to work:
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// compile-flags: -C prefer-dynamic
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#![feature(plugin_registrar, rustc_private)]
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#![crate_type = "dylib"]
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#![deny(region_hierarchy)]
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extern crate syntax;
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#[macro_use]
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extern crate rustc;
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extern crate rustc_plugin;
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use rustc::lint::{LateContext, LintPass, LateLintPass, LintArray, LintContext};
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use rustc::hir;
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use rustc::hir::intravisit::FnKind;
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use rustc::middle::region::CodeExtent;
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use rustc::util::nodemap::FxHashMap;
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use syntax::ast::{self, NodeId};
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use syntax::codemap::Span;
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declare_lint!(REGION_HIERARCHY, Warn, "warn about bogus region hierarchy");
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struct Pass {
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map: FxHashMap<CodeExtent, NodeId>
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}
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impl LintPass for Pass {
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fn get_lints(&self) -> LintArray { lint_array!(REGION_HIERARCHY) }
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}
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impl LateLintPass for Pass {
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fn check_fn(&mut self, cx: &LateContext,
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fk: FnKind, _: &hir::FnDecl, expr: &hir::Expr,
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span: Span, node: ast::NodeId)
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{
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if let FnKind::Closure(..) = fk { return }
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let mut extent = cx.tcx.region_maps.node_extent(expr.id);
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while let Some(parent) = cx.tcx.region_maps.opt_encl_scope(extent) {
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extent = parent;
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}
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if let Some(other) = self.map.insert(extent, node) {
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cx.span_lint(REGION_HIERARCHY, span, &format!(
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"different fns {:?}, {:?} with the same root extent {:?}",
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cx.tcx.map.local_def_id(other),
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cx.tcx.map.local_def_id(node),
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extent));
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}
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}
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}
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#[plugin_registrar]
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pub fn plugin_registrar(reg: &mut ::rustc_plugin::Registry) {
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reg.register_late_lint_pass(Box::new(
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Pass { map: FxHashMap() }
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));
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}
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@ -0,0 +1,30 @@
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// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// aux-build:lint.rs
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#![feature(plugin)]
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#![plugin(lint)]
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struct Foo {
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}
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impl Foo {
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fn bar(&self) -> usize {
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22
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}
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fn baz(&self) -> usize {
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22
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}
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}
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fn main() { }
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