fix: detect if a key provided by a plugin would overwrite a registrat…

…ion (#27)

src/ape/managers/compilers.py

@@ -25,6 +25,10 @@ def registered_compilers(self) -> Dict[str, CompilerAPI]:
             compiler = compiler_class()
 
             for extension in extensions:
+
+                if extension in registered_compilers:
+                    raise  # Extension already registered!
+
                 registered_compilers[extension] = compiler
 
         return registered_compilers

src/ape/managers/project.py

@@ -48,6 +48,10 @@ def contracts(self) -> Dict[str, ContractType]:
         contract_types = {}
         for filepath in self.sources:
             contract_type = self.compilers.compile(filepath)
+
+            if contract_type.contractName in contract_types:
+                raise  # ContractType collision across compiler plugins
+
             contract_types[contract_type.contractName] = contract_type
 
         return contract_types