Auto merge of rust-lang#15730 - Alainx277:let-else-postfix, r=Veykril

Add postfix completion for let else

Adds a postfix completion for let else syntax, similar to the if let postfix.

Author: bors

crates/ide-completion/src/completions/postfix.rs

@@ -84,6 +84,13 @@ pub(crate) fn complete_postfix(
                 )
                 .add_to(acc, ctx.db);
 
+                postfix_snippet(
+                    "lete",
+                    "let Ok else {}",
+                    &format!("let Ok($1) = {receiver_text} else {{\n    $2\n}};\n$0"),
+                )
+                .add_to(acc, ctx.db);
+
                 postfix_snippet(
                     "while",
                     "while let Ok {}",
@@ -99,6 +106,13 @@ pub(crate) fn complete_postfix(
                 )
                 .add_to(acc, ctx.db);
 
+                postfix_snippet(
+                    "lete",
+                    "let Some else {}",
+                    &format!("let Some($1) = {receiver_text} else {{\n    $2\n}};\n$0"),
+                )
+                .add_to(acc, ctx.db);
+
                 postfix_snippet(
                     "while",
                     "while let Some {}",
@@ -469,6 +483,29 @@ fn main() {
         );
     }
 
+    #[test]
+    fn option_letelse() {
+        check_edit(
+            "lete",
+            r#"
+//- minicore: option
+fn main() {
+    let bar = Some(true);
+    bar.$0
+}
+"#,
+            r#"
+fn main() {
+    let bar = Some(true);
+    let Some($1) = bar else {
+    $2
+};
+$0
+}
+"#,
+        );
+    }
+
     #[test]
     fn result_match() {
         check_edit(