Annotate erroring functions in session and parser

Author: catamorphism

src/comp/driver/session.rs

@@ -79,13 +79,13 @@ state obj session(ast::crate_num cnum,
         ret cnum;
     }
 
-    fn span_err(span sp, str msg) {
+    fn span_err(span sp, str msg) -> ! {
         // FIXME: Use constants, but rustboot doesn't know how to export them.
         emit_diagnostic(sp, msg, "error", 9u8, cm);
         fail;
     }
 
-    fn err(str msg) {
+    fn err(str msg) -> ! {
         log_err #fmt("error: %s", msg);
         fail;
     }
@@ -107,19 +107,19 @@ state obj session(ast::crate_num cnum,
         emit_diagnostic(sp, msg, "note", 10u8, cm);
     }
 
-    fn bug(str msg) {
+    fn bug(str msg) -> ! {
         log_err #fmt("error: internal compiler error %s", msg);
         fail;
     }
 
-    fn span_unimpl(span sp, str msg) {
+    fn span_unimpl(span sp, str msg) -> ! {
         // FIXME: Use constants, but rustboot doesn't know how to export them.
         emit_diagnostic(sp, "internal compiler error: unimplemented " + msg,
                         "error", 9u8, cm);
         fail;
     }
-
-    fn unimpl(str msg) {
+    
+    fn unimpl(str msg) -> ! {
         log_err #fmt("error: unimplemented %s", msg);
         fail;
     }

src/comp/front/parser.rs

@@ -31,7 +31,7 @@ state type parser =
     state obj {
           fn peek() -> token::token;
           fn bump();
-          fn err(str s);
+          fn err(str s) -> !;
           fn restrict(restriction r);
           fn get_restriction() -> restriction;
           fn get_file_type() -> file_type;
@@ -85,7 +85,7 @@ fn new_parser(session::session sess,
                 hi = rdr.get_chpos();
             }
 
-            fn err(str m) {
+            fn err(str m) -> ! {
                 sess.span_err(rec(lo=lo, hi=hi), m);
             }
 
@@ -217,7 +217,7 @@ fn bad_expr_word_table() -> std::map::hashmap[str, ()] {
     ret words;
 }
 
-fn unexpected(&parser p, token::token t) {
+fn unexpected(&parser p, token::token t) -> ! {
     let str s = "unexpected token: ";
     s += token::to_str(p.get_reader(), t);
     p.err(s);