doc: update E2000

Author: peter-jerry-ye

next/language/error_codes/E2000.md

@@ -16,22 +16,31 @@ There are some common alerts that you may encounter:
 
 ## Erroneous example
 
-```{literalinclude} /sources/error_codes/E2000_error/top.mbt
+```{literalinclude} /sources/error_codes/2000_error/lib/top.mbt
 :language: moonbit
+:caption: lib/top.mbt
+```
+
+```{literalinclude} /sources/error_codes/2000_error/top.mbt
+:language: moonbit
+:caption: top.mbt
 ```
 
 ## Suggestion
 
 One way to fix the alert, is to change your code as suggested by the message (like `deprecated`):
 
-```{literalinclude} /sources/error_codes/E2000_fixed/top.mbt
+```{literalinclude} /sources/error_codes/2000_fixed/top.mbt
 :language: moonbit
+:caption: top.mbt
 ```
 
 If you clearly know what you are doing and would like to suppress the alert, you can change the `moon.pkg.json` file for packages where you would like to disable **this kind of alert**. For example:
 
-```{literalinclude} /sources/error_codes/E2000_fixed/top_1.mbt
+```{literalinclude} /sources/error_codes/2000_fixed/moon.pkg.json
 :language: moonbit
+:caption: moon.pkg.json
+:emphasize-lines: 6
 ```
 
 ```{note}

next/sources/error_codes/2000_error/lib/moon.pkg.json

@@ -0,0 +1 @@
+{}

next/sources/error_codes/2000_error/lib/top.mbt

@@ -0,0 +1,14 @@
+///| 
+#deprecated("Use `greet` instead")
+pub fn greeting() -> String {
+  "Hello!"
+}
+
+///|
+pub fn greet(name~ : String = "") -> String {
+  if name != "" {
+    "Hello!"
+  } else {
+    "Hello, \{name}!"
+  }
+}

next/sources/error_codes/2000_error/moon.mod.json

@@ -0,0 +1 @@
+{"name": "moonbit-community/E2000"}

next/sources/error_codes/2000_error/moon.pkg.json

@@ -0,0 +1,6 @@
+{
+  "is-main": true,
+  "import": [
+    "moonbit-community/E2000/lib"
+  ]
+}

next/sources/error_codes/2000_error/top.mbt

@@ -0,0 +1,5 @@
+///|
+fn main {
+  println(@lib.greeting())
+  //      ^~~~~~~~ Warning (Alert deprecated): Use `greet` instead(2000)
+}

next/sources/error_codes/2000_fixed/lib/moon.pkg.json

@@ -0,0 +1 @@
+{}

next/sources/error_codes/2000_fixed/lib/top.mbt

@@ -0,0 +1,14 @@
+///| 
+#deprecated("Use `greet` instead")
+pub fn greeting() -> String {
+  "Hello!"
+}
+
+///|
+pub fn greet(name~ : String = "") -> String {
+  if name != "" {
+    "Hello!"
+  } else {
+    "Hello, \{name}!"
+  }
+}

next/sources/error_codes/2000_fixed/moon.mod.json

@@ -0,0 +1 @@
+{"name": "moonbit-community/E2000-fixed"}

next/sources/error_codes/2000_fixed/moon.pkg.json

@@ -0,0 +1,7 @@
+{
+  "is-main": true,
+  "import": [
+    "moonbit-community/E2000-fixed/lib"
+  ],
+  "alert-list": "-deprecated"
+}