Remove barely used zstd dependency

crates/compiler/module/src/module_err.rs

@@ -1,30 +1,45 @@
-use snafu::{Backtrace, Snafu};
-
 use crate::symbol::IdentId;
 
-#[derive(Debug, Snafu)]
-#[snafu(visibility(pub))]
+#[derive(Debug)]
 pub enum ModuleError {
-    #[snafu(display(
-        "ModuleIdNotFound: I could not find the ModuleId {} in Interns.all_ident_ids: {}.",
-        module_id,
-        all_ident_ids
-    ))]
     ModuleIdNotFound {
         module_id: String,
         all_ident_ids: String,
-        backtrace: Backtrace,
     },
-    #[snafu(display(
-        "IdentIdNotFound: I could not find IdentId {:?} in ident_ids {:?}.",
-        ident_id,
-        ident_ids_str
-    ))]
     IdentIdNotFound {
         ident_id: IdentId,
         ident_ids_str: String,
-        backtrace: Backtrace,
     },
 }
 
+impl std::fmt::Display for ModuleError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::ModuleIdNotFound {
+                module_id,
+                all_ident_ids,
+            } => {
+                write!(
+                    f,
+                    "ModuleIdNotFound: I could not find the ModuleId {} in Interns.all_ident_ids: {}.",
+                    module_id,
+                    all_ident_ids
+                )
+            }
+            Self::IdentIdNotFound {
+                ident_id,
+                ident_ids_str,
+            } => {
+                write!(
+                    f,
+                    "IdentIdNotFound: I could not find IdentId {:?} in ident_ids {:?}.",
+                    ident_id, ident_ids_str
+                )
+            }
+        }
+    }
+}
+
+impl std::error::Error for ModuleError {}
+
 pub type ModuleResult<T, E = ModuleError> = std::result::Result<T, E>;