diff --git a/examples/1230-ffi-extern-same-name-authors.sx b/examples/1230-ffi-extern-same-name-authors.sx
new file mode 100644
index 0000000..1b3ae52
--- /dev/null
+++ b/examples/1230-ffi-extern-same-name-authors.sx
@@ -0,0 +1,21 @@
+// Two flat FILE imports each declare the SAME libc symbol `absval` via the
+// `extern` keyword (the linkage-keyword twin of example 0729's `#foreign`
+// form). The bare-call resolver must NOT count extern authors when deciding
+// ambiguity — they are external C symbols, never rerouted by the bare-call
+// machinery, so the existing first-wins foreign/extern dispatch binds the
+// call and a same-name extern collision compiles + runs (prints 7), it does
+// NOT error as ambiguous.
+//
+// Regression (FFI-linkage Part B): `isPlainFreeFn` / `isPlainFreeFnDecl`
+// excluded a `#foreign` body but classified an empty-block `extern` fn as a
+// plain free function, so the two extern authors were wrongly counted as an
+// ambiguous bare-call collision. Prerequisite for migrating the fn-decl
+// `#foreign` path onto `extern`.
+#import "modules/std.sx";
+#import "1230-ffi-extern-same-name-authors/a.sx";
+#import "1230-ffi-extern-same-name-authors/b.sx";
+
+main :: () -> i32 {
+    print("absval = {}\n", absval(-7));
+    0
+}
diff --git a/examples/1230-ffi-extern-same-name-authors/a.sx b/examples/1230-ffi-extern-same-name-authors/a.sx
new file mode 100644
index 0000000..1e60dc0
--- /dev/null
+++ b/examples/1230-ffi-extern-same-name-authors/a.sx
@@ -0,0 +1,6 @@
+// One of two flat authors of `absval`, an `extern` libc binding — the
+// `extern` twin of example 0729's `#foreign libc "abs"`. A consumer
+// flat-importing BOTH must NOT see this as an ambiguous bare-call
+// collision: extern authors (external C symbols) are excluded from the
+// bare-call ambiguity verdict, exactly like their `#foreign` twins.
+absval :: (n: i32) -> i32 extern libc "abs";
diff --git a/examples/1230-ffi-extern-same-name-authors/b.sx b/examples/1230-ffi-extern-same-name-authors/b.sx
new file mode 100644
index 0000000..f6148ce
--- /dev/null
+++ b/examples/1230-ffi-extern-same-name-authors/b.sx
@@ -0,0 +1,2 @@
+// The second flat author of `absval` — the identical `extern` binding.
+absval :: (n: i32) -> i32 extern libc "abs";
diff --git a/examples/expected/1230-ffi-extern-same-name-authors.exit b/examples/expected/1230-ffi-extern-same-name-authors.exit
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/examples/expected/1230-ffi-extern-same-name-authors.exit
@@ -0,0 +1 @@
+0
diff --git a/examples/expected/1230-ffi-extern-same-name-authors.stderr b/examples/expected/1230-ffi-extern-same-name-authors.stderr
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/examples/expected/1230-ffi-extern-same-name-authors.stderr
@@ -0,0 +1 @@
+
diff --git a/examples/expected/1230-ffi-extern-same-name-authors.stdout b/examples/expected/1230-ffi-extern-same-name-authors.stdout
new file mode 100644
index 0000000..bb4defe
--- /dev/null
+++ b/examples/expected/1230-ffi-extern-same-name-authors.stdout
@@ -0,0 +1 @@
+absval = 7