fix: module syntax — changed src_bux/*.bux from module X; to module X { ... }

src_bux/ast.bux

@@ -1,5 +1,5 @@
 // ast.bux — AST node types (Expr, Stmt, Decl, Pattern, TypeExpr)
-module Ast;
+module Ast {
 
 // ---------------------------------------------------------------------------
 // SourceLocation (inline for convenience)
@@ -351,4 +351,4 @@ func Ast_MakeDecl(kind: int, line: uint32, col: uint32) -> Decl {
         aliasType: null as *TypeExpr,
         extFuncDll: "", extFuncVariadic: false, extFuncRetType: null as *TypeExpr,
         childDecl1: null as *Decl, childDecl2: null as *Decl };
-}
+}