feat(diagnostics): use default expression instead of todo! when missing fields

Signed-off-by: Benjamin Coenen <5719034+bnjjj@users.noreply.github.com>

crates/rust-analyzer/src/config.rs

@@ -45,7 +45,7 @@ use crate::{
 // parsing the old name.
 config_data! {
     struct ConfigData {
-        /// How assists will fill missing elements in an expression.
+        /// Placeholder for missing expressions in assists.
         assist_exprFillDefault: ExprFillDefaultDef              = "\"todo\"",
         /// How imports should be grouped into use statements.
         assist_importGranularity |
@@ -1272,7 +1272,7 @@ fn field_props(field: &str, ty: &str, doc: &[&str], default: &str) -> serde_json
             "type": "string",
             "enum": ["todo", "default"],
             "enumDescriptions": [
-                "Fill missing expressions with the 'todo' macro",
+                "Fill missing expressions with the `todo` macro",
                 "Fill missing expressions with reasonable defaults, `new` or `default` constructors."
             ],
         },

docs/user/generated_config.adoc

@@ -1,7 +1,7 @@
 [[rust-analyzer.assist.exprFillDefault]]rust-analyzer.assist.exprFillDefault (default: `"todo"`)::
 +
 --
-How assists will fill missing elements in an expression.
+Placeholder for missing expressions in assists.
 --
 [[rust-analyzer.assist.importGranularity]]rust-analyzer.assist.importGranularity (default: `"crate"`)::
 +

editors/code/package.json

@@ -379,7 +379,7 @@
                 },
                 "$generated-start": {},
                 "rust-analyzer.assist.exprFillDefault": {
-                    "markdownDescription": "How assists will fill missing elements in an expression.",
+                    "markdownDescription": "Placeholder for missing expressions in assists.",
                     "default": "todo",
                     "type": "string",
                     "enum": [
@@ -387,7 +387,7 @@
                         "default"
                     ],
                     "enumDescriptions": [
-                        "Fill missing expressions with the 'todo' macro",
+                        "Fill missing expressions with the `todo` macro",
                         "Fill missing expressions with reasonable defaults, `new` or `default` constructors."
                     ]
                 },
@@ -1507,4 +1507,4 @@
             ]
         }
     }
-}
+}