Rust: Use getStaticTarget in type inference test

This fixes a test failure where duplicated functions from extraction caused a bunch of spurious results to pop up

Author: paldepind

rust/ql/test/library-tests/type-inference/main.rs

@@ -398,7 +398,7 @@ mod impl_overlap {
 
     pub fn f() {
         let x = S1;
-        println!("{:?}", x.common_method()); // $ method=S1::common_method SPURIOUS: method=<S1_as_OverlappingTrait>::common_method
+        println!("{:?}", x.common_method()); // $ method=S1::common_method
         println!("{:?}", x.common_method_2()); // $ method=S1::common_method_2
     }
 }

rust/ql/test/library-tests/type-inference/type-inference.ql

@@ -24,7 +24,7 @@ module ResolveTest implements TestSig {
       location = source.getLocation() and
       element = source.toString()
     |
-      target = resolveMethodCallExpr(source) and
+      target = source.(MethodCallExpr).getStaticTarget() and
       functionHasValue(target, value) and
       tag = "method"
       or