4 files changed, 14 insertions, 1 deletions
diff --git a/src/binaryen-c.cpp b/src/binaryen-c.cpp
index 5ae3b7a10..4dff289fb 100644
--- a/src/binaryen-c.cpp
+++ b/src/binaryen-c.cpp
@@ -364,6 +364,11 @@ BinaryenExpressionRef BinaryenUnreachable(BinaryenModuleRef module) {
   return static_cast<Expression*>(((Module*)module)->allocator.alloc<Unreachable>());
 }
 
+void BinaryenExpressionPrint(BinaryenExpressionRef expr) {
+  WasmPrinter::printExpression((Expression*)expr, std::cout);
+  std::cout << '\n';
+}
+
 // Functions
 
 BinaryenFunctionRef BinaryenAddFunction(BinaryenModuleRef module, const char* name, BinaryenFunctionTypeRef type, BinaryenType* localTypes, BinaryenIndex numLocalTypes, BinaryenExpressionRef body) {
diff --git a/src/binaryen-c.h b/src/binaryen-c.h
index b9343012c..a587e03ac 100644
--- a/src/binaryen-c.h
+++ b/src/binaryen-c.h
@@ -288,6 +288,9 @@ BinaryenExpressionRef BinaryenHost(BinaryenModuleRef module, BinaryenOp op, cons
 BinaryenExpressionRef BinaryenNop(BinaryenModuleRef module);
 BinaryenExpressionRef BinaryenUnreachable(BinaryenModuleRef module);
 
+// Print an expression to stdout. Useful for debugging.
+void BinaryenExpressionPrint(BinaryenExpressionRef expr);
+
 // Functions
 
 typedef void* BinaryenFunctionRef;
@@ -324,7 +327,7 @@ void BinaryenSetStart(BinaryenModuleRef module, BinaryenFunctionRef start);
 // ========== Module Operations ==========
 //
 
-// Print a module to stdout.
+// Print a module to stdout. Useful for debugging.
 void BinaryenModulePrint(BinaryenModuleRef module);
 
 // Validate a module, showing errors on problems.
diff --git a/test/example/c-api-kitchen-sink.c b/test/example/c-api-kitchen-sink.c
index ad499291a..4cbbb8fb5 100644
--- a/test/example/c-api-kitchen-sink.c
+++ b/test/example/c-api-kitchen-sink.c
@@ -192,6 +192,8 @@ void test_core() {
     BinaryenUnreachable(module),
   };
 
+  BinaryenExpressionPrint(valueList[3]); // test printing a standalone expression
+
   // Make the main body of the function. and one block with a return value, one without
   BinaryenExpressionRef value = BinaryenBlock(module, "the-value", valueList, sizeof(valueList) / sizeof(BinaryenExpressionRef));
   BinaryenExpressionRef nothing = BinaryenBlock(module, "the-nothing", &value, 1);
diff --git a/test/example/c-api-kitchen-sink.txt b/test/example/c-api-kitchen-sink.txt
index 52b6cd6ed..a5fa729c8 100644
--- a/test/example/c-api-kitchen-sink.txt
+++ b/test/example/c-api-kitchen-sink.txt
@@ -3,6 +3,9 @@ BinaryenInt32: 1
 BinaryenInt64: 2
 BinaryenFloat32: 3
 BinaryenFloat64: 4
+(f32.neg
+  (f32.const -33.61199951171875)
+)
 (module
   (memory 1 256
     (segment 10 "hello, world")