From 51873637fa5563acc2a92d59ce02598bc3648b53 Mon Sep 17 00:00:00 2001
From: ringabout <43030857+ringabout@users.noreply.github.com>
Date: Tue, 24 Feb 2026 18:10:01 +0800
Subject: [PATCH] allows implicitRangeConvs for literals

---
 compiler/sempass2.nim                     | 1 +
 tests/range/timplicitrangedownsizing3.nim | 7 +++++++
 2 files changed, 8 insertions(+)
 create mode 100644 tests/range/timplicitrangedownsizing3.nim

diff --git a/compiler/sempass2.nim b/compiler/sempass2.nim
index c1279f3754..ceb79adaef 100644
--- a/compiler/sempass2.nim
+++ b/compiler/sempass2.nim
@@ -1550,6 +1550,7 @@ proc track(tracked: PEffects, n: PNode) =
 
     # Check for implicit range conversions
     if n.kind == nkHiddenStdConv and (not tracked.isArrayIndexing) and
+          n[1].kind notin {nkCharLit..nkUInt64Lit, nkFloatLit..nkFloat64Lit} and
           shouldWarnRangeConversion(tracked.config, n.info, n.typ, n[1].typ):
       message(tracked.config, n.info, warnImplicitRangeConversion,
               typeToString(n[1].typ) & " -> " & typeToString(n.typ))
diff --git a/tests/range/timplicitrangedownsizing3.nim b/tests/range/timplicitrangedownsizing3.nim
new file mode 100644
index 0000000000..f16ea3d35e
--- /dev/null
+++ b/tests/range/timplicitrangedownsizing3.nim
@@ -0,0 +1,7 @@
+discard """
+  matrix: "--warning:systemRangeConversion --warningaserror:systemRangeConversion"
+"""
+
+proc foo(x: range[0..100]) = discard
+
+foo(12)
\ No newline at end of file