Rust: add testcase for impl trait on i32

Author: aibaars

rust/ql/test/extractor-tests/canonical_path/canonical_paths.expected

@@ -27,6 +27,8 @@ canonicalPath
 | regular.rs:57:1:63:1 | fn enum_match | test::regular::enum_match |
 | regular.rs:66:5:66:40 | fn is_alphanum | test::regular::is_alphanum |
 | regular.rs:69:1:71:1 | fn is_number_or_letter | test::regular::is_number_or_letter |
+| regular.rs:73:1:75:1 | trait Abs | test::regular::Abs |
+| regular.rs:74:5:74:25 | fn abs | <_ as test::regular::Abs>::abs |
 canonicalPaths
 | anonymous.rs:1:1:1:26 | use ...::Trait | None | None |
 | anonymous.rs:3:1:32:1 | fn canonicals | repo::test | crate::anonymous::canonicals |
@@ -70,6 +72,10 @@ canonicalPaths
 | regular.rs:65:1:67:1 | ExternBlock | None | None |
 | regular.rs:66:5:66:40 | fn is_alphanum | repo::test | ::is_alphanum |
 | regular.rs:69:1:71:1 | fn is_number_or_letter | repo::test | crate::regular::is_number_or_letter |
+| regular.rs:73:1:75:1 | trait Abs | repo::test | crate::regular::Abs |
+| regular.rs:74:5:74:25 | fn abs | repo::test | crate::regular::Abs::abs |
+| regular.rs:77:1:85:1 | impl Abs for i32 { ... } | None | None |
+| regular.rs:78:5:84:5 | fn abs | repo::test | <i32 as crate::regular::Abs>::abs |
 resolvedPaths
 | anonymous.rs:27:17:27:30 | OtherStruct {...} | None | None |
 | anonymous.rs:28:9:28:9 | s | None | None |
@@ -103,3 +109,6 @@ resolvedPaths
 | regular.rs:61:9:61:31 | ...::Variant3 {...} | repo::test | crate::regular::MyEnum::Variant3 |
 | regular.rs:70:14:70:24 | is_alphanum | repo::test | ::is_alphanum |
 | regular.rs:70:26:70:28 | chr | None | None |
+| regular.rs:79:12:79:15 | self | None | None |
+| regular.rs:80:14:80:17 | self | None | None |
+| regular.rs:82:13:82:16 | self | None | None |

rust/ql/test/extractor-tests/canonical_path/regular.rs

@@ -69,3 +69,17 @@ extern "C" {
 pub fn is_number_or_letter(chr: u8) -> bool {
     unsafe { is_alphanum(chr) }
 }
+
+trait Abs {
+    fn abs(self) -> Self;
+}
+
+impl Abs for i32 {
+    fn abs(self) -> Self {
+        if self < 0 {
+            -self
+        } else {
+            self
+        }
+    }
+}