fix: Fix format_args lowering passing incorrect parameters to rustc_parse_format

Author: Veykril

src/tools/rust-analyzer/crates/hir-def/src/body/lower.rs

@@ -17,7 +17,7 @@ use syntax::{
         self, ArrayExprKind, AstChildren, BlockExpr, HasArgList, HasAttrs, HasLoopBody, HasName,
         RangeItem, SlicePatComponents,
     },
-    AstNode, AstPtr, SyntaxNodePtr,
+    AstNode, AstPtr, AstToken as _, SyntaxNodePtr,
 };
 use triomphe::Arc;
 
@@ -1577,7 +1577,13 @@ impl ExprCollector<'_> {
             });
         });
         let template = f.template();
-        let fmt_snippet = template.as_ref().map(ToString::to_string);
+        let fmt_snippet = template.as_ref().and_then(|it| match it {
+            ast::Expr::Literal(literal) => match literal.kind() {
+                ast::LiteralKind::String(s) => Some(s.text().to_owned()),
+                _ => None,
+            },
+            _ => None,
+        });
         let mut mappings = vec![];
         let fmt = match template.and_then(|it| self.expand_macros_to_string(it)) {
             Some((s, is_direct_literal)) => format_args::parse(

src/tools/rust-analyzer/crates/hir-def/src/body/tests.rs

@@ -150,7 +150,7 @@ fn desugar_builtin_format_args() {
 fn main() {
     let are = "are";
     let count = 10;
-    builtin#format_args("hello {count:02} {} friends, we {are:?} {0}{last}", "fancy", last = "!");
+    builtin#format_args("\u{1b}hello {count:02} {} friends, we {are:?} {0}{last}", "fancy", last = "!");
 }
 "#,
     );
@@ -161,7 +161,7 @@ fn main() {
             let count = 10;
             builtin#lang(Arguments::new_v1_formatted)(
                 &[
-                    "hello ", " ", " friends, we ", " ", "",
+                    "\u{1b}hello ", " ", " friends, we ", " ", "",
                 ],
                 &[
                     builtin#lang(Argument::new_display)(

src/tools/rust-analyzer/crates/hir-def/src/hir/format_args.rs

@@ -175,7 +175,13 @@ pub(crate) fn parse(
     mut synth: impl FnMut(Name) -> ExprId,
     mut record_usage: impl FnMut(Name, Option<TextRange>),
 ) -> FormatArgs {
-    let text = s.text_without_quotes();
+    let Ok(text) = s.value() else {
+        return FormatArgs {
+            template: Default::default(),
+            arguments: args.finish(),
+            orphans: vec![],
+        };
+    };
     let str_style = match s.quote_offsets() {
         Some(offsets) => {
             let raw = usize::from(offsets.quotes.0.len()) - 1;
@@ -186,7 +192,7 @@ pub(crate) fn parse(
     };
 
     let mut parser =
-        parse::Parser::new(text, str_style, fmt_snippet, false, parse::ParseMode::Format);
+        parse::Parser::new(&text, str_style, fmt_snippet, false, parse::ParseMode::Format);
 
     let mut pieces = Vec::new();
     while let Some(piece) = parser.next() {