Update wat crate.

Update the `wat` crate to latest version and use `Error::set_path` in
`Module::from_file` to properly record the path associated with errors.

crates/fuzzing/Cargo.toml

@@ -22,7 +22,7 @@ wasm-smith = "0.4.4"
 wasmi = "0.7.0"
 
 [dev-dependencies]
-wat = "1.0.36"
+wat = "1.0.37"
 
 [features]
 experimental_x64 = ["wasmtime/experimental_x64"]

crates/lightbeam/Cargo.toml

@@ -28,7 +28,7 @@ wasmparser = "0.77"
 
 [dev-dependencies]
 lazy_static = "1.2"
-wat = "1.0.36"
+wat = "1.0.37"
 quickcheck = "1.0.0"
 anyhow = "1.0"
 

crates/test-programs/Cargo.toml

@@ -20,7 +20,7 @@ pretty_env_logger = "0.4.0"
 tempfile = "3.1.0"
 os_pipe = "0.9"
 anyhow = "1.0.19"
-wat = "1.0.36"
+wat = "1.0.37"
 cap-std = "0.13"
 
 [features]

crates/wasmtime/src/module.rs

@@ -228,10 +228,23 @@ impl Module {
     /// # }
     /// ```
     pub fn from_file(engine: &Engine, file: impl AsRef<Path>) -> Result<Module> {
-        Self::new(
+        match Self::new(
             engine,
-            &fs::read(file).with_context(|| "failed to read input file")?,
-        )
+            &fs::read(&file).with_context(|| "failed to read input file")?,
+        ) {
+            Ok(m) => Ok(m),
+            Err(e) => {
+                cfg_if::cfg_if! {
+                    if #[cfg(feature = "wat")] {
+                        let mut e = e.downcast::<wat::Error>()?;
+                        e.set_path(file);
+                        bail!(e)
+                    } else {
+                        Err(e)
+                    }
+                }
+            }
+        }
     }
 
     /// Creates a new WebAssembly `Module` from the given in-memory `binary`