Teach rustc about reserved keywords

Author: brson

src/Makefile

@@ -569,6 +569,13 @@ TEST_XFAILS_RUSTC := $(filter-out \
                         multiline-comment-line-tracking.rs \
                         output-type-mismatch.rs \
                         rec-missing-fields.rs \
+                        reserved-dec.rs \
+                        reserved-f128.rs \
+                        reserved-f16.rs \
+                        reserved-f80.rs \
+                        reserved-m128.rs \
+                        reserved-m32.rs \
+                        reserved-m64.rs \
                         tail-non-call.rs \
                         tail-typeck.rs \
                         type-shadow.rs \

src/comp/front/lexer.rs

@@ -90,7 +90,6 @@ fn new_reader(stdio_reader rdr, str filename) -> reader
         }
 
     auto keywords = new_str_hash[token.token]();
-    auto reserved = new_str_hash[()]();
 
     keywords.insert("mod", token.MOD);
     keywords.insert("use", token.USE);
@@ -191,6 +190,16 @@ fn new_reader(stdio_reader rdr, str filename) -> reader
     keywords.insert("f32", token.MACH(common.ty_f32));
     keywords.insert("f64", token.MACH(common.ty_f64));
 
+    auto reserved = new_str_hash[()]();
+
+    reserved.insert("f16", ());  // IEEE 754-2008 'binary16' interchange fmt
+    reserved.insert("f80", ());  // IEEE 754-1985 'extended'
+    reserved.insert("f128", ()); // IEEE 754-2008 'binary128'
+    reserved.insert("m32", ());  // IEEE 754-2008 'decimal32'
+    reserved.insert("m64", ());  // IEEE 754-2008 'decimal64'
+    reserved.insert("m128", ()); // IEEE 754-2008 'decimal128'
+    reserved.insert("dec", ());  // One of m32, m64, m128
+
     ret reader(rdr, filename, rdr.getc() as char, rdr.getc() as char,
                1u, 0u, 1u, 0u, keywords, reserved);
 }
@@ -425,6 +434,12 @@ impure fn next_token(reader rdr) -> token.token {
             ret kwds.get(accum_str);
         }
 
+        auto rsvd = rdr.get_reserved();
+        if (rsvd.contains_key(accum_str)) {
+            log "reserved keyword";
+            fail;
+        }
+
         ret token.IDENT(accum_str);
     }
 

src/test/compile-fail/reserved-dec.rs

@@ -0,0 +1,5 @@
+// error-pattern:reserved keyword
+
+fn main() {
+  let int dec = 0;
+}

src/test/compile-fail/reserved-f128.rs

@@ -0,0 +1,5 @@
+// error-pattern:reserved keyword
+
+fn main() {
+  let int f128 = 0;
+}

src/test/compile-fail/reserved-f16.rs

@@ -0,0 +1,5 @@
+// error-pattern:reserved keyword
+
+fn main() {
+  let int f16 = 0;
+}

src/test/compile-fail/reserved-f80.rs

@@ -0,0 +1,5 @@
+// error-pattern:reserved keyword
+
+fn main() {
+  let int f80 = 0;
+}

src/test/compile-fail/reserved-m128.rs

@@ -0,0 +1,5 @@
+// error-pattern:reserved keyword
+
+fn main() {
+  let int m128 = 0;
+}

src/test/compile-fail/reserved-m32.rs

@@ -0,0 +1,5 @@
+// error-pattern:reserved keyword
+
+fn main() {
+  let int m32 = 0;
+}

src/test/compile-fail/reserved-m64.rs

@@ -0,0 +1,5 @@
+// error-pattern:reserved keyword
+
+fn main() {
+  let int m64 = 0;
+}