From 4c972ba0d63ddacef6b032b8e3e014cd62fc16f6 Mon Sep 17 00:00:00 2001
From: Jovan Gerbscheid <56355248+JovanGerb@users.noreply.github.com>
Date: Tue, 18 Nov 2025 10:31:31 +0000
Subject: [PATCH] fix: add missing `s!` in `UInt64.fromJson?` (#11237)

This PR fixes the error thrown by `UInt64.fromJson?` and
`USize.fromJson?` to use the missing `s!`.
---
 src/Lean/Data/Json/FromToJson/Basic.lean | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/Lean/Data/Json/FromToJson/Basic.lean b/src/Lean/Data/Json/FromToJson/Basic.lean
index afdb7e4e39..60e79038b7 100644
--- a/src/Lean/Data/Json/FromToJson/Basic.lean
+++ b/src/Lean/Data/Json/FromToJson/Basic.lean
@@ -155,7 +155,7 @@ def bignumToJson (n : Nat) : Json :=
 protected def _root_.USize.fromJson? (j : Json) : Except String USize := do
   let n ← bignumFromJson? j
   if n ≥ USize.size then
-    throw "value '{j}' is too large for `USize`"
+    throw s!"value '{j}' is too large for `USize`"
   return USize.ofNat n
 
 instance : FromJson USize where
@@ -167,7 +167,7 @@ instance : ToJson USize where
 protected def _root_.UInt64.fromJson? (j : Json) : Except String UInt64 := do
   let n ← bignumFromJson? j
   if n ≥ UInt64.size then
-    throw "value '{j}' is too large for `UInt64`"
+    throw s!"value '{j}' is too large for `UInt64`"
   return UInt64.ofNat n
 
 instance : FromJson UInt64 where