Fix Hermes get original function name

.gitignore

@@ -1,3 +1,4 @@
 .DS_Store
 target
 Cargo.lock
+.idea

src/hermes.rs

@@ -108,8 +108,10 @@ impl SourceMapHermes {
 
         // Find the closest mapping, just like here:
         // https://github.com/facebook/metro/blob/63b523eb20e7bdf62018aeaf195bb5a3a1a67f36/packages/metro-symbolicate/src/SourceMetadataMapConsumer.js#L204-L231
+        // Mappings use 1-based index for lines, and 0-based index for cols, as seen here:
+        // https://github.com/facebook/metro/blob/f2d80cebe66d3c64742f67259f41da26e83a0d8d/packages/metro/src/Server/symbolicate.js#L58-L60
         let (_mapping_idx, mapping) =
-            greatest_lower_bound(&function_map.mappings, &token.get_src(), |o| {
+            greatest_lower_bound(&function_map.mappings, &(token.get_src_line() + 1, token.get_src_col()), |o| {
                 (o.line, o.column)
             })?;
         function_map

tests/test_hermes.rs

@@ -19,6 +19,12 @@ fn test_react_native_hermes() {
         ("input.js", 2, 0, None)
     );
     assert_eq!(sm.get_original_function_name(11857), Some("<global>"));
+
+    assert_eq!(
+        sm.lookup_token(0, 11947).unwrap().to_tuple(),
+        ("module.js", 1, 4, None)
+    );
+    assert_eq!(sm.get_original_function_name(11947), Some("foo"));
 }
 
 #[test]