Added more warnings

src/frontend/compiler.nim

@@ -1212,14 +1212,13 @@ proc endScope(self: Compiler) =
     for name in self.names:
         if name.depth > self.depth:
             names.add(name)
-            if not name.resolved and not self.replMode:
-                self.warning(UnusedName, &"'{name.ident.token.lexeme}' is declared but not used")
-                #continue
             if name.owner != self.currentModule and self.depth > -1:
                 # Names coming from other modules only go out of scope
                 # when the global scope is closed (i.e. at the end of
                 # the module)
                 continue
+            if not name.resolved and not self.replMode:
+                self.warning(UnusedName, &"'{name.ident.token.lexeme}' is declared but not used")
             if name.kind == NameKind.Var:
                 inc(popCount)
             elif name.kind == NameKind.Argument:
@@ -1752,8 +1751,16 @@ proc blockStmt(self: Compiler, node: BlockStmt) =
     ## Compiles block statements, which create a new
     ## local scope
     self.beginScope()
+    var last: Declaration
     for decl in node.code:
+        if not last.isNil():
+            case last.kind:
+                of breakStmt, continueStmt:
+                    self.warning(UnreachableCode, &"code after '{last.token.lexeme}' statement is unreachable")
+                else:
+                    discard
         self.declaration(decl)
+        last = decl
     self.endScope()
 
 
@@ -2014,7 +2021,6 @@ proc deferStmt(self: Compiler, node: DeferStmt) =
 
 proc returnStmt(self: Compiler, node: ReturnStmt) =
     ## Compiles return statements
-
     if not node.value.isNil():
         self.expression(node.value)
         self.emitByte(OpCode.SetResult, node.token.line)
@@ -2282,9 +2288,14 @@ proc funDecl(self: Compiler, node: FunDecl, name: Name) =
         # the try/finally block with the deferred
         # code
         var deferStart = self.deferred.len()
+        var last: Declaration
         self.beginScope()
         for decl in BlockStmt(node.body).code:
+            if not last.isNil():
+                if last.kind == returnStmt:
+                    self.warning(UnreachableCode, "code after 'return' statement is unreachable")
             self.declaration(decl)
+            last = decl
         let typ = self.currentFunction.valueType.returnType
         var hasVal: bool = false
         case self.currentFunction.valueType.fun.kind: