finish engram-lang: protocols, decorators, imports, Result, closures, stdlib, integration tests

crates/el-build/src/build.rs

@@ -298,9 +298,9 @@ impl BuildSystem {
 
         let source = std::fs::read_to_string(&entry)?;
         let tokens = el_lexer::tokenize(&source)
-            .map_err(|e| el_compiler::CompileError::Lex(e))?;
+            .map_err(el_compiler::CompileError::Lex)?;
         let program = el_parser::parse(tokens, source.clone())
-            .map_err(|e| el_compiler::CompileError::Parse(e))?;
+            .map_err(el_compiler::CompileError::Parse)?;
         let mut checker = el_types::TypeChecker::with_builtins();
         let diags = checker.check(&program);
         Ok(diags.iter().map(|d| d.message.clone()).collect())

crates/el-build/src/plugin.rs

@@ -117,7 +117,7 @@ impl PluginRegistry {
         manifest: &Manifest,
         plugin_dir: &Path,
     ) -> Result<(), PluginError> {
-        for (name, _version) in &manifest.plugins {
+        for name in manifest.plugins.keys() {
             // TODO(LLVM backend): use `libloading` crate to dlopen the .dylib/.so,
             // look up the `engram_plugin_init` symbol, call it, and register the
             // returned Box<dyn CompilerPlugin>.