Add polymorph token

core_compiler_interface.hpp

@@ -127,6 +127,7 @@ for i in meta.token_kinds:
     TK_DoubleColon,
     TK_At,
     TK_Arrow,
+    TK_Polymorph,
     TK_ExprSizeof,
     TK_DocComment,
     TK_Comment,

core_lexing.cpp

@@ -410,6 +410,15 @@ lex__stream(Core_Ctx *lexer) {
                 CASE3('&', TK_BitAnd, TK_AndAssign, TK_And);
                 CASE3('|', TK_BitOr, TK_OrAssign, TK_Or);
 
+            case '$': {
+                t.kind = TK_Polymorph;
+                lex_parse_ident(table, s, &t);
+                t.str += 1;
+                t.len -= 1;
+                t.intern_val = intern_string(table, t.string);
+                if (t.len == 0) token_error(&t, "Polymorph token without content"_s);
+            } break;
+
             case '#': {
                 t.kind = TK_Pound;
                 lex_parse_ident(table, s, &t);
@@ -758,6 +767,7 @@ for i in meta.token_kinds:
         case TK_DoubleColon: return "::";
         case TK_At: return "@";
         case TK_Arrow: return "->";
+        case TK_Polymorph: return "$";
         case TK_ExprSizeof: return "[SizeOf]";
         case TK_DocComment: return "[///]";
         case TK_Comment: return "//";

examples/push_struct.core

@@ -1,7 +1,7 @@
 MA :: #import "Arena.core"
 
 /*
-PushStruct :: (a: *MA.Arena, $Type): *Type
+PushStruct :: (a: *MA.Arena, $T: Type): *$T
 	size := size_of(Type)
 	result := PushSize(a, size)
 	return result

examples/unions.core

@@ -37,4 +37,4 @@ examples/unions.core - Error! Couldn't infer type of compound expression
 	c = {10}
 */
 
-	return 0
+	return 0

meta.py

@@ -83,6 +83,7 @@ token_rest = [
   ["DoubleColon", "::"],
   ["At", "@"],
   ["Arrow", "->"],
+  ["Polymorph", "$"],
   ["ExprSizeof", "[SizeOf]"],
   ["DocComment", "[///]"],
   ["Comment", "//"],