From 54b6b43922dc8c6b6384b13bc158d5274b7ad76d Mon Sep 17 00:00:00 2001
From: yuyi <yuyi98@163.com>
Date: Wed, 2 Nov 2022 20:21:28 +0800
Subject: [PATCH] cgen: fix dump(none) (#16287)

---
 vlib/v/gen/c/dumpexpr.v          | 9 ++++++++-
 vlib/v/tests/inout/dump_none.out | 1 +
 vlib/v/tests/inout/dump_none.vv  | 3 +++
 3 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 vlib/v/tests/inout/dump_none.out
 create mode 100644 vlib/v/tests/inout/dump_none.vv

diff --git a/vlib/v/gen/c/dumpexpr.v b/vlib/v/gen/c/dumpexpr.v
index a9543392ef..3ee76e5ba4 100644
--- a/vlib/v/gen/c/dumpexpr.v
+++ b/vlib/v/gen/c/dumpexpr.v
@@ -45,7 +45,12 @@ fn (mut g Gen) dump_expr_definitions() {
 		deref, _ := deref_kind(str_method_expects_ptr, is_ptr, dump_type)
 		to_string_fn_name := g.get_str_fn(typ.clear_flag(.shared_f))
 		ptr_asterisk := if is_ptr { '*'.repeat(typ.nr_muls()) } else { '' }
-		mut str_dumparg_type := g.cc_type(dump_type, true) + ptr_asterisk
+		mut str_dumparg_type := ''
+		if dump_sym.kind == .none_ {
+			str_dumparg_type = 'IError' + ptr_asterisk
+		} else {
+			str_dumparg_type = g.cc_type(dump_type, true) + ptr_asterisk
+		}
 		if dump_sym.kind == .function {
 			fninfo := dump_sym.info as ast.FnType
 			str_dumparg_type = 'DumpFNType_$name'
@@ -67,6 +72,8 @@ fn (mut g Gen) dump_expr_definitions() {
 		surrounder.add('\tstring sline = int_str(line);', '\tstring_free(&sline);')
 		if dump_sym.kind == .function {
 			surrounder.add('\tstring value = ${to_string_fn_name}();', '\tstring_free(&value);')
+		} else if dump_sym.kind == .none_ {
+			surrounder.add('\tstring value = _SLIT("none");', '\tstring_free(&value);')
 		} else {
 			surrounder.add('\tstring value = ${to_string_fn_name}(${deref}dump_arg);',
 				'\tstring_free(&value);')
diff --git a/vlib/v/tests/inout/dump_none.out b/vlib/v/tests/inout/dump_none.out
new file mode 100644
index 0000000000..828cf154e3
--- /dev/null
+++ b/vlib/v/tests/inout/dump_none.out
@@ -0,0 +1 @@
+[vlib/v/tests/inout/dump_none.vv:2] none: none
diff --git a/vlib/v/tests/inout/dump_none.vv b/vlib/v/tests/inout/dump_none.vv
new file mode 100644
index 0000000000..76d05596db
--- /dev/null
+++ b/vlib/v/tests/inout/dump_none.vv
@@ -0,0 +1,3 @@
+fn main() {
+	dump(none)
+}