Rust: Undo hiding some warnings in the extraction consistency check query.

Author: geoffw0

rust/ql/consistency-queries/ExtractionConsistency.ql

@@ -12,7 +12,5 @@ query predicate extractionError(ExtractionError ee) {
 }
 
 query predicate extractionWarning(ExtractionWarning ew) {
-  (not exists(ew.getLocation()) or ew.getLocation().fromSource()) and
-  // macro expansion failures are expected for macros like compile_error! and panic!
-  not ew.getMessage().matches("macro expansion failed for%")
+  (not exists(ew.getLocation()) or ew.getLocation().fromSource())
 }

rust/ql/test/extractor-tests/macro-expansion/CONSISTENCY/ExtractionConsistency.expected

@@ -0,0 +1,2 @@
+extractionWarning
+| macro_expansion.rs:56:9:56:31 | macro expansion failed for 'concat' |

rust/ql/test/query-tests/diagnostics/CONSISTENCY/ExtractionConsistency.expected

@@ -5,3 +5,4 @@ extractionWarning
 | does_not_compile.rs:2:21:2:20 | expected SEMICOLON |
 | does_not_compile.rs:2:26:2:25 | expected SEMICOLON |
 | error.rs:2:5:2:17 | An error! |
+| my_macro.rs:17:9:17:27 | macro expansion failed for 'myUndefinedMacro' |