From 15b6d6ae795fdf95352ee17bbd5160a707995f7e Mon Sep 17 00:00:00 2001
From: Teddy Wing
Date: Fri, 26 May 2023 21:26:45 +0200
Subject: Add README

---
 README.md | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 README.md

diff --git a/README.md b/README.md
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+godefererr
+==========
+
+[![GoDoc](https://godocs.io/gopkg.teddywing.com/defererr?status.svg)][Documentation]
+
+An analyser that reports incorrectly returned errors from defer closures.
+
+Errors can be returned from a `defer` closure by assigning the error to a
+captured variable declared in the function signature. This analyser looks for
+defer closures that assign captured error variables and checks that they are
+correctly declared and returned.
+
+
+## Example
+Given the following program:
+
+``` go
+package main
+
+import (
+	"errors"
+	"log"
+)
+
+func main() {
+	err := returnErrorFromDefer()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	log.Println("test")
+}
+
+func returnErrorFromDefer() error { // return signature should be '(err error)'
+	var err error = nil
+	if err != nil {
+		return err
+	}
+
+	defer func() {
+		err = errors.New("defer error")
+	}()
+
+	return nil // return should use 'err'
+}
+```
+
+the analyser produces the following results:
+
+	$ godefererr ./...
+	package_doc_example.go:17:29: return signature should use named error parameter err
+	package_doc_example.go:27:9: does not return 'err'
+
+
+## Install
+
+	$ go install gopkg.teddywing.com/defererr/cmd/godefererr@latest
+
+
+## License
+Copyright © 2023 Teddy Wing. Licensed under the GNU GPLv3+ (see the included
+COPYING file).
+
+
+[Documentation]: https://godocs.io/gopkg.teddywing.com/defererr
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