Fix a couple of bugs, add some new cool stuff.
1. Fix a todo in Parser::ParseTag, to recover better. On code like
that in test/Sema/decl-invalid.c it causes us to return a single
error instead of multiple.
2. Fix an error in Sema::ParseDeclarator, where it would crash if the
declarator didn't have an identifier. Instead, diagnose the problem.
3. Start adding infrastructure to track the range of locations covered
by a declspec or declarator. This is mostly implemented for declspec,
but could be improved, it is missing for declarator.
Thanks to Neil for pointing out this crash.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@40482 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/unused-expr.c b/test/Sema/unused-expr.c
new file mode 100644
index 0000000..667f286
--- /dev/null
+++ b/test/Sema/unused-expr.c
@@ -0,0 +1,26 @@
+// RUN: clang -parse-ast-check %s
+
+int foo(int X, int Y);
+
+void bar(volatile int *VP, int *P, int A,
+ _Complex double C, volatile _Complex double VC) {
+
+ VP == P; // expected-warning {{expression result unused}}
+ (void)A; // expected-warning {{expression result unused}}
+ (void)foo(1,2); // no warning.
+
+ A == foo(1, 2); // expected-warning {{expression result unused}}
+
+ foo(1,2)+foo(4,3); // expected-warning {{expression result unused}}
+
+
+ *P; // expected-warning {{expression result unused}}
+ *VP; // no warning.
+ P[4]; // expected-warning {{expression result unused}}
+ VP[4]; // no warning.
+
+ // FIXME: SEMA explodes on these.
+ //__real__ C;
+ //__real__ VC;
+}
+