make manifest resolve error more informational (#5852)

Author: YaroShkvorets

graph/src/data/subgraph/mod.rs

@@ -370,7 +370,7 @@ pub enum SubgraphManifestResolveError {
     NonUtf8,
     #[error("subgraph is not valid YAML")]
     InvalidFormat,
-    #[error("resolve error: {0}")]
+    #[error("resolve error: {0:#}")]
     ResolveError(#[from] anyhow::Error),
 }
 

graph/src/data_source/common.rs

@@ -81,7 +81,8 @@ impl UnresolvedMappingABI {
                 self.name, self.file.link
             )
         })?;
-        let contract = Contract::load(&*contract_bytes)?;
+        let contract = Contract::load(&*contract_bytes)
+            .with_context(|| format!("failed to load ABI {}", self.name))?;
         Ok(MappingABI {
             name: self.name,
             contract,