bugs related to constat types

R=r
DELTA=10  (6 added, 4 deleted, 0 changed)
OCL=14348
CL=14348

test/bugs/bug090.go

@@ -36,4 +36,10 @@ func main() {
 	i = f3div2;	// BUG: probably shouldn't compile
 	assert(i == c3div2, "i == c3div2 from f3div2");
 	assert(i != f3div2, "i != f3div2");	// BUG: certainly shouldn't fail
+
+	const g float64 = 1.0;
+	i = g;  // BUG: shouldn't compile
+
+	const h float64 = 3.14;
+	i = h;  // BUG: certainly shouldn't compile
 }

test/const.go

@@ -89,10 +89,6 @@ func floats() {
 	assert(i == f0, "i == f0");
 	i = fm1;
 	assert(i == fm1, "i == fm1");
-	i = f1;
-	assert(i == f1, "i == f1");
-	i = f1e3;
-	assert(i == f1e3, "i == f1e3");
 
 	// verify that all are assignable as floats
 	var f float64;