Rust: fix extractor-tests

Author: aibaars

rust/ql/test/extractor-tests/literal/literal.ql

@@ -1,13 +1,16 @@
 import rust
+import TestUtils
 
-query predicate charLiteral(CharLiteralExpr e) { any() }
+query predicate charLiteral(CharLiteralExpr e) { toBeTested(e) }
 
-query predicate stringLiteral(StringLiteralExpr e) { any() }
+query predicate stringLiteral(StringLiteralExpr e) { toBeTested(e) }
 
 query predicate integerLiteral(IntegerLiteralExpr e, string suffix) {
-  suffix = concat(e.getSuffix())
+  toBeTested(e) and suffix = concat(e.getSuffix())
 }
 
-query predicate floatLiteral(FloatLiteralExpr e, string suffix) { suffix = concat(e.getSuffix()) }
+query predicate floatLiteral(FloatLiteralExpr e, string suffix) {
+  toBeTested(e) and suffix = concat(e.getSuffix())
+}
 
-query predicate booleanLiteral(BooleanLiteralExpr e) { any() }
+query predicate booleanLiteral(BooleanLiteralExpr e) { toBeTested(e) }