From 9fef7ca224d3620146c39f41432bcf3094153e36 Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Wed, 6 Aug 2025 17:10:06 -0300
Subject: [PATCH] cgen: fix anon fn checking adding unresolved generic type on
 codegen (fix #25050) (#25055)

---
 vlib/v/gen/c/fn.v                          |   3 +
 vlib/v/tests/generics/generic_array_test.v | 113 +++++++++++++++++++++
 2 files changed, 116 insertions(+)
 create mode 100644 vlib/v/tests/generics/generic_array_test.v

diff --git a/vlib/v/gen/c/fn.v b/vlib/v/gen/c/fn.v
index 998583a677..11f8ed1257 100644
--- a/vlib/v/gen/c/fn.v
+++ b/vlib/v/gen/c/fn.v
@@ -218,6 +218,9 @@ fn (mut g Gen) gen_fn_decl(node &ast.FnDecl, skip bool) {
 				the_type := syms.map(it.name).join(', ')
 				println('gen fn `${node.name}` for type `${the_type}`')
 			}
+			if concrete_types.any(it.has_flag(.generic)) {
+				continue
+			}
 			g.cur_concrete_types = concrete_types
 			g.gen_fn_decl(node, skip)
 		}
diff --git a/vlib/v/tests/generics/generic_array_test.v b/vlib/v/tests/generics/generic_array_test.v
new file mode 100644
index 0000000000..0246492c05
--- /dev/null
+++ b/vlib/v/tests/generics/generic_array_test.v
@@ -0,0 +1,113 @@
+import arrays
+
+pub fn Canvas.new(width int, height int) &Canvas {
+	return &Canvas{
+		layers: create_buffer(width, height)
+	}
+}
+
+pub fn (canvas Canvas) size() (int, int) {
+	return canvas.layers[0].len, canvas.layers.len
+}
+
+pub fn (canvas Canvas) string() string {
+	output := buffer_to_braille(canvas.layers, dots_to_braille_rune_map)
+	return arrays.join_to_string(output, '\n', |row| arrays.join_to_string(row, '', |character| '${character}'))
+}
+
+pub fn (mut canvas Canvas) set(x int, y int) {
+	canvas.layers[y][x] = true
+}
+
+pub fn (mut canvas Canvas) unset(x int, y int) {
+	canvas.layers[y][x] = false
+}
+
+pub fn (mut canvas Canvas) clear() {
+	width, height := canvas.size()
+	canvas.layers = create_buffer(width, height)
+}
+
+struct Canvas {
+mut:
+	layers [][]bool
+}
+
+const dots_to_braille = [u8(0), 3, 1, 4, 2, 5, 6, 7]
+const dots_to_braille_rune_map = memoize_dots_to_braille_rune()
+
+fn dots_to_braille_rune(dots u8) rune {
+	mut mask := 0
+	for index in 0 .. 8 {
+		if ((dots >> index) & 1) == 1 {
+			mask |= 1 << dots_to_braille[index]
+		}
+	}
+
+	return rune(0x2800 + mask)
+}
+
+fn memoize_dots_to_braille_rune() [256]rune {
+	mut memo := [256]rune{}
+
+	for index in 0 .. 256 {
+		memo[index] = dots_to_braille_rune(index)
+	}
+
+	return memo
+}
+
+fn buffer_to_braille(buffer [][]bool, braille_mapping [256]rune) [][]rune {
+	out_rows := buffer.len / 4
+	out_cols := buffer[0].len / 2
+	mut output := [][]rune{len: out_rows, init: []rune{len: out_cols}}
+
+	for row := 0; row < out_rows; row += 1 {
+		row_offset := row * 4
+		for column := 0; column < out_cols; column += 1 {
+			col_offset := column * 2
+
+			mut dots := u8(buffer[row_offset + 0][col_offset + 0])
+			dots |= u8(buffer[row_offset + 0][col_offset + 1]) << 1
+			dots |= u8(buffer[row_offset + 1][col_offset + 0]) << 2
+			dots |= u8(buffer[row_offset + 1][col_offset + 1]) << 3
+			dots |= u8(buffer[row_offset + 2][col_offset + 0]) << 4
+			dots |= u8(buffer[row_offset + 2][col_offset + 1]) << 5
+			dots |= u8(buffer[row_offset + 3][col_offset + 0]) << 6
+			dots |= u8(buffer[row_offset + 3][col_offset + 1]) << 7
+
+			output[row][column] = dots_to_braille_rune(dots)
+		}
+	}
+
+	return output
+}
+
+fn create_buffer(width int, height int) [][]bool {
+	return [][]bool{len: height, init: []bool{len: width}}
+}
+
+fn test_main() {
+	braille_mapping := memoize_dots_to_braille_rune()
+	width, height := 40, 48
+	mut canvas := Canvas.new(width, height)
+	mut buffer := [][]bool{len: height, init: []bool{len: width}}
+
+	minr := 16 * 16
+	maxr := 20 * 20
+	for y := 0; y < 48; y += 1 {
+		for x := 0; x < width; x += 1 {
+			cy := y - 24
+			big_cx := x - 20
+			small_cx := x - 16
+			big := (big_cx * big_cx) + (cy * cy)
+			small := (small_cx * small_cx) + (cy * cy)
+			if small > minr && big < maxr {
+				buffer[y][x] = true
+				canvas.set(x, y)
+			}
+		}
+	}
+
+	_ := buffer_to_braille(buffer, braille_mapping)
+}