Merge #3392

3392: Implement concat eager macro  r=matklad a=edwin0cheng

This PR implements the following things:

1. Add basic eager macro infrastructure by introducing `EagerCallId` such that the new `MacroCallId` is defined as :

```
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum MacroCallId {
    LazyMacro(LazyMacroId),
    EagerMacro(EagerMacroId),
}
```

2. Add `concat!` builtin macro.




Co-authored-by: Edwin Cheng <[email protected]>

1 files changed, 7 insertions, 1 deletions

diff --git a/crates/ra_syntax/src/ast/make.rs b/crates/ra_syntax/src/ast/make.rs
index 3f11b747f..0da24560e 100644
--- a/crates/ra_syntax/src/ast/make.rs
+++ b/crates/ra_syntax/src/ast/make.rs
@@ -219,7 +219,7 @@ fn unroot(n: SyntaxNode) -> SyntaxNode {
 }
 
 pub mod tokens {
-    use crate::{AstNode, Parse, SourceFile, SyntaxKind::*, SyntaxToken, T};
+    use crate::{ast, AstNode, Parse, SourceFile, SyntaxKind::*, SyntaxToken, T};
     use once_cell::sync::Lazy;
 
     pub(super) static SOURCE_FILE: Lazy<Parse<SourceFile>> =
@@ -251,6 +251,12 @@ pub mod tokens {
         sf.syntax().first_child_or_token().unwrap().into_token().unwrap()
     }
 
+    pub fn literal(text: &str) -> SyntaxToken {
+        assert_eq!(text.trim(), text);
+        let lit: ast::Literal = super::ast_from_text(&format!("fn f() {{ let _ = {}; }}", text));
+        lit.syntax().first_child_or_token().unwrap().into_token().unwrap()
+    }
+
     pub fn single_newline() -> SyntaxToken {
         SOURCE_FILE
             .tree()