Auto merge of #4671 - flip1995:ice-4671, r=phansch

Fix ICE in `use_self` lint

The ICE is produced by building this span:
55e7818a06/clippy_lints/src/use_self.rs (L55-L60)

`span` can start in the file the macro is defined in and end where the macro is called.

changelog: Fix ICE in `use_self` lint

.travis.yml

@@ -56,14 +56,14 @@ matrix:
       if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
     - env: INTEGRATION=rust-lang-nursery/chalk
       if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
-    # - env: INTEGRATION=rust-lang/rls
+    - env: INTEGRATION=rust-lang/rls
-    #   if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
+      if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
     - env: INTEGRATION=Geal/nom
       if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
     - env: INTEGRATION=rust-lang/rustfmt
       if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
-    # - env: INTEGRATION=hyperium/hyper
+    - env: INTEGRATION=hyperium/hyper
-    #   if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
+      if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
     - env: INTEGRATION=bluss/rust-itertools
       if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
     - env: INTEGRATION=serde-rs/serde
@@ -72,8 +72,8 @@ matrix:
       if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
     - env: INTEGRATION=rust-random/rand
       if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
-    # - env: INTEGRATION=rust-lang-nursery/futures-rs
+    - env: INTEGRATION=rust-lang-nursery/futures-rs
-    #   if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
+      if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
     - env: INTEGRATION=Marwes/combine
       if: repo =~ /^rust-lang\/rust-clippy$/ AND branch IN (auto, try)
     - env: INTEGRATION=rust-lang-nursery/failure

clippy_lints/src/use_self.rs

@@ -10,7 +10,7 @@ use rustc::{declare_lint_pass, declare_tool_lint};
 use rustc_errors::Applicability;
 use syntax_pos::symbol::kw;
 
-use crate::utils::span_lint_and_sugg;
+use crate::utils::{differing_macro_contexts, span_lint_and_sugg};
 
 declare_clippy_lint! {
     /// **What it does:** Checks for unnecessary repetition of structure name when a
@@ -56,6 +56,11 @@ fn span_use_self_lint(cx: &LateContext<'_, '_>, path: &Path, last_segment: Optio
 
     // Path segments only include actual path, no methods or fields.
     let last_path_span = last_segment.ident.span;
+
+    if differing_macro_contexts(path.span, last_path_span) {
+        return;
+    }
+
     // Only take path up to the end of last_path_span.
     let span = path.span.with_hi(last_path_span.hi());
 

tests/ui/auxiliary/use_self_macro.rs

@@ -0,0 +1,15 @@
+macro_rules! use_self {
+    (
+        impl $ty:ident {
+            fn func(&$this:ident) {
+                [fields($($field:ident)*)]
+            }
+        }
+    ) => (
+        impl  $ty {
+            fn func(&$this) {
+                let $ty { $($field),* } = $this;
+            }
+        }
+    )
+}

tests/ui/ice-4671.rs

@@ -0,0 +1,21 @@
+#![warn(clippy::use_self)]
+
+#[macro_use]
+#[path = "auxiliary/use_self_macro.rs"]
+mod use_self_macro;
+
+struct Foo {
+    a: u32,
+}
+
+use_self! {
+    impl Foo {
+        fn func(&self) {
+            [fields(
+                a
+            )]
+        }
+    }
+}
+
+fn main() {}