From 82798096a3f5eb84a2aa2b22bb63ffca88f79da7 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Wed, 11 Mar 2026 13:08:59 +0300
Subject: [PATCH] checker: some bug with comptime (fixes #26234)

---
 .../meta/040776e8d0a3acba.json                |   7 +
 .../meta/0a48ed07efa6063a.json                |   7 +
 .../meta/0b9d0aaf8b2b6d1a.json                |   7 +
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 .../meta/fbc139b18a2c449a.json                |   7 +
 ...JT6ZSMW545FNTPHR90.635435000.000000000.csv | 335 ++++++++++++++++++
 ...selector_postfix_unwrap_non_option_err.out |   7 +
 ..._selector_postfix_unwrap_non_option_err.vv |  16 +
 vlib/v/gen/c/cgen.v                           |  15 +
 vlib/v/markused/walker.v                      |   5 +
 .../comptime_selector_postfix_unwrap_test.v   |  21 ++
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index 000000000..484e63e79
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diff --git a/.vtmp_cov_issue_24842/meta/c1e57721f657c117.json b/.vtmp_cov_issue_24842/meta/c1e57721f657c117.json
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index 000000000..a251b8902
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index 000000000..33f27db21
--- /dev/null
+++ b/.vtmp_cov_issue_24842/meta/d5d57d723d666651.json
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+{
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--- /dev/null
+++ b/.vtmp_cov_issue_24842/meta/de05fb7aa1fa23d2.json
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+{
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index 000000000..22319d841
--- /dev/null
+++ b/.vtmp_cov_issue_24842/meta/ee234faa36d4f67c.json
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+{
+  "file": "/Users/alexander/code/worktrees/batch4/issue-26234/vlib/math/bits/bits.arm64.v", "fhash": "ee234faa36d4f67c",
+  "v_version": "V 0.5.1 07ee934f822c7a2980e0dc31ca635a6c734dcbca",
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index 000000000..32a4fce92
--- /dev/null
+++ b/.vtmp_cov_issue_24842/meta/f2ee1cd455612aef.json
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+{
+  "file": "/Users/alexander/code/worktrees/batch4/issue-26234/vlib/os/environment.c.v", "fhash": "f2ee1cd455612aef",
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diff --git a/.vtmp_cov_issue_24842/meta/fbc139b18a2c449a.json b/.vtmp_cov_issue_24842/meta/fbc139b18a2c449a.json
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index 000000000..6d146eebb
--- /dev/null
+++ b/.vtmp_cov_issue_24842/meta/fbc139b18a2c449a.json
@@ -0,0 +1,7 @@
+{
+  "file": "/Users/alexander/code/worktrees/batch4/issue-26234/vlib/v/preludes/test_runner.c.v", "fhash": "fbc139b18a2c449a",
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diff --git a/.vtmp_cov_issue_24842/vcounters_01KKE5QEJT6ZSMW545FNTPHR90.635435000.000000000.csv b/.vtmp_cov_issue_24842/vcounters_01KKE5QEJT6ZSMW545FNTPHR90.635435000.000000000.csv
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+++ b/.vtmp_cov_issue_24842/vcounters_01KKE5QEJT6ZSMW545FNTPHR90.635435000.000000000.csv
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diff --git a/vlib/v/checker/tests/comptime_selector_postfix_unwrap_non_option_err.out b/vlib/v/checker/tests/comptime_selector_postfix_unwrap_non_option_err.out
new file mode 100644
index 000000000..d3c60774c
--- /dev/null
+++ b/vlib/v/checker/tests/comptime_selector_postfix_unwrap_non_option_err.out
@@ -0,0 +1,7 @@
+vlib/v/checker/tests/comptime_selector_postfix_unwrap_non_option_err.vv:5:30: cgen error: cannot use `?` on non-option expression
+    3 |         $for field in T.fields {
+    4 |             tmp := T{}
+    5 |             _ = int(tmp.$(field.name) ?)
+      |                                       ^
+    6 |         }
+    7 |     }
diff --git a/vlib/v/checker/tests/comptime_selector_postfix_unwrap_non_option_err.vv b/vlib/v/checker/tests/comptime_selector_postfix_unwrap_non_option_err.vv
new file mode 100644
index 000000000..803f9be3b
--- /dev/null
+++ b/vlib/v/checker/tests/comptime_selector_postfix_unwrap_non_option_err.vv
@@ -0,0 +1,16 @@
+fn unwrap_field[T]() {
+	$if T is $struct {
+		$for field in T.fields {
+			tmp := T{}
+			_ = int(tmp.$(field.name) ?)
+		}
+	}
+}
+
+struct Test {
+	a int
+}
+
+fn main() {
+	unwrap_field[Test]()
+}
diff --git a/vlib/v/gen/c/cgen.v b/vlib/v/gen/c/cgen.v
index a6451bf5c..e68a4f1bb 100644
--- a/vlib/v/gen/c/cgen.v
+++ b/vlib/v/gen/c/cgen.v
@@ -4291,6 +4291,21 @@ fn (mut g Gen) expr(node_ ast.Expr) {
 				g.expr(node.expr)
 				g.write(')')
 			} else if node.op == .question {
+				mut expr_type := ast.void_type
+				if mut node.expr is ast.ComptimeSelector {
+					if node.expr.field_expr is ast.SelectorExpr
+						&& g.comptime.is_comptime_selector_field_name(node.expr.field_expr, 'name') {
+						expr_type = g.unwrap_generic(g.comptime.comptime_for_field_type)
+					}
+				} else if mut node.expr is ast.Ident && node.expr.ct_expr {
+					expr_type = g.get_comptime_for_var_type(node.expr, g.type_resolver.get_type_or_default(node.expr,
+						ast.void_type))
+				}
+				if expr_type != ast.void_type {
+					if !expr_type.has_flag(.option) {
+						g.error('cannot use `?` on non-option expression', node.pos)
+					}
+				}
 				cur_line := g.go_before_last_stmt().trim_space()
 				mut expr_str := ''
 				mut is_unwrapped := true
diff --git a/vlib/v/markused/walker.v b/vlib/v/markused/walker.v
index 85863deac..75fb8b898 100644
--- a/vlib/v/markused/walker.v
+++ b/vlib/v/markused/walker.v
@@ -527,6 +527,7 @@ fn (mut w Walker) expr(node_ ast.Expr) {
 		ast.ComptimeSelector {
 			w.expr(node.left)
 			w.expr(node.field_expr)
+			w.or_block(node.or_block)
 		}
 		ast.ComptimeCall {
 			w.expr(node.left)
@@ -818,6 +819,10 @@ fn (mut w Walker) expr(node_ ast.Expr) {
 		}
 		ast.PostfixExpr {
 			w.expr(node.expr)
+			if node.op == .question {
+				w.used_option++
+				w.used_panic++
+			}
 		}
 		ast.RangeExpr {
 			if node.has_low {
diff --git a/vlib/v/tests/comptime/comptime_selector_postfix_unwrap_test.v b/vlib/v/tests/comptime/comptime_selector_postfix_unwrap_test.v
new file mode 100644
index 000000000..61c971c22
--- /dev/null
+++ b/vlib/v/tests/comptime/comptime_selector_postfix_unwrap_test.v
@@ -0,0 +1,21 @@
+fn generic_unwrap[T](value T) []int {
+	mut out := []int{}
+	$if T is $struct {
+		$for field in T.fields {
+			$if field.typ is ?int {
+				out << value.$(field.name) ?
+			}
+		}
+	}
+	return out
+}
+
+struct PostfixOptionField {
+	a ?int
+}
+
+fn test_generic_comptime_selector_postfix_unwrap() {
+	assert generic_unwrap(PostfixOptionField{
+		a: 7
+	}) == [7]
+}
-- 
2.39.5