js: prefix V builtin functions, so they do not overlap with JS (#11483)

vlib/v/gen/js/fn.v

@@ -2,6 +2,7 @@ module js
 
 import v.ast
 import v.util
+import v.parser
 
 fn (mut g JsGen) js_mname(name_ string) string {
 	mut is_js := false
@@ -234,9 +235,9 @@ fn (mut g JsGen) method_call(node ast.CallExpr) {
 				g.stmt(it.or_block.stmts.last())
 			}
 			.propagate {
-				panicstr := '`optional not set (\${err})`'
+				panicstr := '`optional not set (\${err.val.msg})`'
 				if g.file.mod.name == 'main' && g.fn_decl.name == 'main.main' {
-					g.writeln('return panic($panicstr)')
+					g.writeln('return builtin__panic($panicstr)')
 				} else {
 					g.writeln('js_throw(err)')
 				}
@@ -268,7 +269,11 @@ fn (mut g JsGen) gen_call_expr(it ast.CallExpr) {
 	node := it
 	g.call_stack << it
 	mut name := g.js_name(it.name)
+
 	is_print := name in ['print', 'println', 'eprint', 'eprintln', 'panic']
+	if name in parser.builtin_functions {
+		name = 'builtin__$name'
+	}
 	print_method := name
 	ret_sym := g.table.get_type_symbol(it.return_type)
 	if it.language == .js && ret_sym.name in v_types && ret_sym.name != 'void' {
@@ -324,7 +329,7 @@ fn (mut g JsGen) gen_call_expr(it ast.CallExpr) {
 			.propagate {
 				panicstr := '`optional not set (\${err.val.msg})`'
 				if g.file.mod.name == 'main' && g.fn_decl.name == 'main.main' {
-					g.writeln('return panic($panicstr)')
+					g.writeln('return builtin__panic($panicstr)')
 				} else {
 					g.writeln('js_throw(err)')
 				}

vlib/v/gen/js/js.v

@@ -9,6 +9,7 @@ import v.util.version
 import v.depgraph
 import encoding.base64
 import v.gen.js.sourcemap
+import v.parser
 
 struct MutArg {
 	tmp_var string
@@ -1101,14 +1102,14 @@ fn (mut g JsGen) gen_assert_stmt(a ast.AssertStmt) {
 		metaname_fail := g.gen_assert_metainfo(a)
 		g.writeln('	g_test_fails++;')
 		g.writeln('	main__cb_assertion_failed($metaname_fail);')
-		g.writeln('	exit(1);')
+		g.writeln('	builtin__exit(1);')
 		g.writeln('}')
 		return
 	}
 	g.writeln('} else {')
 	g.inc_indent()
-	g.writeln('eprintln(new string("$mod_path:${a.pos.line_nr + 1}: FAIL: fn ${g.fn_decl.name}(): assert $s_assertion"));')
-	g.writeln('exit(1);')
+	g.writeln('builtin__eprintln(new string("$mod_path:${a.pos.line_nr + 1}: FAIL: fn ${g.fn_decl.name}(): assert $s_assertion"));')
+	g.writeln('builtin__exit(1);')
 	g.dec_indent()
 	g.writeln('}')
 }
@@ -1440,7 +1441,9 @@ fn (mut g JsGen) gen_method_decl(it ast.FnDecl, typ FnGenType) {
 	name = g.js_name(name)
 
 	name = g.generic_fn_name(g.table.cur_concrete_types, name, true)
-
+	if name in parser.builtin_functions {
+		name = 'builtin__$name'
+	}
 	has_go := fn_has_go(it)
 	if it.is_pub && !it.is_method {
 		g.push_pub_var(name)

vlib/v/parser/parser.v

@@ -13,7 +13,7 @@ import v.errors
 import os
 import hash.fnv1a
 
-const (
+pub const (
 	builtin_functions = ['print', 'println', 'eprint', 'eprintln', 'isnil', 'panic', 'exit']
 )