Ignore a wasm2wat error that we don't care about

WebAssembly/wabt#842

compiler/base/cargo-wasm

@@ -49,6 +49,12 @@ for wasm in $(find target/ -name '*wasm' -not -path '*/deps/*'); do
         --fold-exprs \
         --generate-names \
         --inline-exports \
+        --ignore-custom-section-errors \
         -o "${output}.wat" \
-        "${wasm}.gc"
+        "${wasm}.gc" \
+        2> >(grep -v 'invalid linking metadata version: 3' 1>&2)
+
+    # wasm2wat spits out an error that we don't care about, so hide it
+    # https://github.com/WebAssembly/wabt/issues/842
+    # https://stackoverflow.com/a/15936384/155423
 done