From 76cc72844fa51072388038f86c7b87285fdbdddc Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Fri, 10 Nov 2023 23:53:41 -0300
Subject: [PATCH] fix

---
 vlib/v/gen/c/cgen.v  | 9 ++++++---
 vlib/v/gen/c/if.v    | 8 ++++++++
 vlib/v/gen/c/infix.v | 7 +++++++
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/vlib/v/gen/c/cgen.v b/vlib/v/gen/c/cgen.v
index 3771bcb0e5898e..c0e887d6ef651c 100644
--- a/vlib/v/gen/c/cgen.v
+++ b/vlib/v/gen/c/cgen.v
@@ -4349,6 +4349,11 @@ fn (mut g Gen) get_const_name(node ast.Ident) string {
 	}
 }
 
+fn (mut g Gen) is_interface_var(var ast.ScopeObject) bool {
+	return var is ast.Var && var.orig_type != 0 && g.table.sym(var.orig_type).kind == .interface_
+		&& g.table.sym(var.smartcasts.last()).kind != .interface_
+}
+
 fn (mut g Gen) ident(node ast.Ident) {
 	prevent_sum_type_unwrapping_once := g.prevent_sum_type_unwrapping_once
 	g.prevent_sum_type_unwrapping_once = false
@@ -4485,9 +4490,7 @@ fn (mut g Gen) ident(node ast.Ident) {
 						g.write('(')
 						if obj_sym.kind == .sum_type && !is_auto_heap {
 							g.write('*')
-						} else if g.inside_casting_to_str && node.obj.orig_type != 0
-							&& g.table.sym(node.obj.orig_type).kind == .interface_
-							&& g.table.sym(node.obj.smartcasts.last()).kind != .interface_ {
+						} else if g.inside_casting_to_str && g.is_interface_var(node.obj) {
 							g.write('*')
 						}
 					}
diff --git a/vlib/v/gen/c/if.v b/vlib/v/gen/c/if.v
index ea9a80916d1512..91ae1d1d7afce0 100644
--- a/vlib/v/gen/c/if.v
+++ b/vlib/v/gen/c/if.v
@@ -378,6 +378,14 @@ fn (mut g Gen) if_expr(node ast.IfExpr) {
 						no_needs_par = true
 					}
 				}
+				if !g.inside_casting_to_str && branch.cond is ast.Ident
+					&& g.is_interface_var(branch.cond.obj) {
+					inside_casting_to_str_old := g.inside_casting_to_str
+					g.inside_casting_to_str = true
+					defer {
+						g.inside_casting_to_str = inside_casting_to_str_old
+					}
+				}
 				if no_needs_par {
 					g.write('if ')
 				} else {
diff --git a/vlib/v/gen/c/infix.v b/vlib/v/gen/c/infix.v
index bbc292f27ed2e3..7db1f2485d7110 100644
--- a/vlib/v/gen/c/infix.v
+++ b/vlib/v/gen/c/infix.v
@@ -1055,6 +1055,13 @@ fn (mut g Gen) gen_plain_infix_expr(node ast.InfixExpr) {
 	}
 	if node.left_type.is_ptr() && node.left.is_auto_deref_var() {
 		g.write('*')
+	} else if !g.inside_casting_to_str && node.left is ast.Ident
+		&& g.is_interface_var(node.left.obj) {
+		inside_casting_to_str_old := g.inside_casting_to_str
+		g.inside_casting_to_str = true
+		defer {
+			g.inside_casting_to_str = inside_casting_to_str_old
+		}
 	}
 	g.expr(node.left)
 	g.write(' ${node.op.str()} ')