From cd9c47140e13d2b55676dc489076f800151cddd1 Mon Sep 17 00:00:00 2001
From: Laylie <202595611+laylie527@users.noreply.github.com>
Date: Mon, 10 Mar 2025 22:47:03 +0800
Subject: [PATCH] Fix scanTuple undeclared identifier 'scanf' (#24759)

Without this fix, trying to use `scanTuple` in a generic proc imported
from a different module fails to compile (`undeclared identifier:
'scanf'`):

```nim
# module.nim
import std/strscans

proc scan*[T](s: string): (bool, string) =
  s.scanTuple("$+")
```

```nim
# main.nim
import ./module

echo scan[int]("foo")
```

Workaround is to `export scanf` in `module.nim` or `import std/strscans`
in `main.nim`.

(cherry picked from commit f8294ce06e61752d15624e0422c5296292ef5467)
---
 lib/pure/strscans.nim                   | 2 +-
 tests/stdlib/mstrscans_undecl_scanf.nim | 4 ++++
 tests/stdlib/tstrscans_undecl_scanf.nim | 3 +++
 3 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 tests/stdlib/mstrscans_undecl_scanf.nim
 create mode 100644 tests/stdlib/tstrscans_undecl_scanf.nim

diff --git a/lib/pure/strscans.nim b/lib/pure/strscans.nim
index 45ba9a469c..cbb1124420 100644
--- a/lib/pure/strscans.nim
+++ b/lib/pure/strscans.nim
@@ -512,7 +512,7 @@ macro scanTuple*(input: untyped; pattern: static[string]; matcherTypes: varargs[
           inc userMatches
       else: discard
     inc p
-  result.add nnkTupleConstr.newTree(newCall(ident("scanf"), input, newStrLitNode(pattern)))
+  result.add nnkTupleConstr.newTree(newCall(bindSym("scanf"), input, newStrLitNode(pattern)))
   for arg in arguments:
     result[^1][0].add arg
     result[^1].add arg
diff --git a/tests/stdlib/mstrscans_undecl_scanf.nim b/tests/stdlib/mstrscans_undecl_scanf.nim
new file mode 100644
index 0000000000..24ce23ee6d
--- /dev/null
+++ b/tests/stdlib/mstrscans_undecl_scanf.nim
@@ -0,0 +1,4 @@
+import std/strscans
+
+proc scan*[T](s: string): (bool, string) =
+  s.scanTuple("$+")
diff --git a/tests/stdlib/tstrscans_undecl_scanf.nim b/tests/stdlib/tstrscans_undecl_scanf.nim
new file mode 100644
index 0000000000..a2b6e8386f
--- /dev/null
+++ b/tests/stdlib/tstrscans_undecl_scanf.nim
@@ -0,0 +1,3 @@
+import std/assertions
+import ./mstrscans_undecl_scanf
+doAssert scan[int]("foo") == (true, "foo")