* tests/sets.at (Broken Closure): Add the ending `;'.

* tests/input.at (Invalid $n, Invalid @n): Likewise.
* tests/output.at (AT_CHECK_OUTPUT): Likewise.
* src/reader.at (readgram): Complain if a rule is not ended with a
semi-colon.

tests/regression.at

@@ -103,7 +103,7 @@ AT_DATA([input.y],
 [[/* Bison used to swallow the character after `}'. */
 
 %%
-exp: { tests = {{{{{{{{{{}}}}}}}}}}; }
+exp: { tests = {{{{{{{{{{}}}}}}}}}}; };
 %%
 ]])
 
@@ -382,7 +382,7 @@ expr:
 
 {
 
-}
+};
 ]])
 
 AT_CHECK([bison input.y -o input.c -v], 0, [], [])