cgen: do not free strings in const decls

vlib/v/gen/cgen.v

@@ -83,7 +83,7 @@ mut:
 	attrs                []string // attributes before next decl stmt
 	is_builtin_mod       bool
 	hotcode_fn_names     []string
-	cur_fn               &ast.FnDecl = 0
+	//cur_fn               ast.FnDecl
 	cur_generic_type     table.Type // `int`, `string`, etc in `foo<T>()`
 	sql_i                int
 	sql_stmt_name        string
@@ -93,6 +93,7 @@ mut:
 	strs_to_free         string
 	inside_call          bool
 	has_main             bool
+	inside_const bool
 }
 
 const (
@@ -2517,6 +2518,11 @@ fn (mut g Gen) return_statement(node ast.Return) {
 }
 
 fn (mut g Gen) const_decl(node ast.ConstDecl) {
+	g.inside_const = true
+	defer {
+		g.inside_const = false
+	}
+
 	for field in node.fields {
 		name := c_name(field.name)
 		// TODO hack. Cut the generated value and paste it into definitions.

vlib/v/gen/fn.v

@@ -28,6 +28,7 @@ fn (mut g Gen) gen_fn_decl(it ast.FnDecl) {
 		g.cur_generic_type = 0
 		return
 	}
+	//g.cur_fn = it
 	fn_start_pos := g.out.len
 	msvc_attrs := g.write_fn_attrs()
 	// Live

vlib/v/gen/str.v

@@ -135,7 +135,6 @@ fn (mut g Gen) string_literal(node ast.StringLiteral) {
 		// g.write('tos4("$escaped_val", $it.val.len)')
 		// g.write('_SLIT("$escaped_val")')
 		g.write('tos_lit("$escaped_val")')
-		// g.write('tos_lit("$escaped_val")')
 	}
 }
 
@@ -143,8 +142,9 @@ fn (mut g Gen) string_inter_literal(node ast.StringInterLiteral) {
 	mut cur_line := ''
 	mut tmp := ''
 	free := g.pref.autofree && g.inside_call && !g.inside_return &&
-		g.inside_ternary == 0 && g.cur_fn != 0 &&
-		g.cur_fn.name != ''
+		g.inside_ternary == 0 && !g.inside_const 
+		//&& g.cur_fn != 0 &&
+		//g.cur_fn.name != ''
 	if free {
 		// Save the string expr in a temporary variable, so that it can be removed after the call.
 		tmp = g.new_tmp_var()