From 8de6511056643b4398a9d85408aa3f81c812d3ba Mon Sep 17 00:00:00 2001
From: StunxFS <56417208+StunxFS@users.noreply.github.com>
Date: Thu, 11 Mar 2021 09:01:53 -0400
Subject: [PATCH] cgen: minor optimization to `for ch in "StringLiteral"`
 (#9240)

---
 vlib/v/gen/c/cgen.v | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/vlib/v/gen/c/cgen.v b/vlib/v/gen/c/cgen.v
index 433d53f304..0dcd5b0230 100644
--- a/vlib/v/gen/c/cgen.v
+++ b/vlib/v/gen/c/cgen.v
@@ -1509,13 +1509,18 @@ fn (mut g Gen) for_in_stmt(node ast.ForInStmt) {
 			}
 		}
 	} else if node.kind == .string {
+		cond := if node.cond is ast.StringLiteral || node.cond is ast.StringInterLiteral {
+			ast.Expr(g.new_ctemp_var_then_gen(node.cond, table.string_type))
+		} else {
+			node.cond
+		}
 		i := if node.key_var in ['', '_'] { g.new_tmp_var() } else { node.key_var }
 		g.write('for (int $i = 0; $i < ')
-		g.expr(node.cond)
+		g.expr(cond)
 		g.writeln('.len; ++$i) {')
 		if node.val_var != '_' {
 			g.write('\tbyte ${c_name(node.val_var)} = ')
-			g.expr(node.cond)
+			g.expr(cond)
 			g.writeln('.str[$i];')
 		}
 	} else if node.kind == .struct_ {