Split inlay hints into modules

crates/ide/src/inlay_hints/implicit_static.rs

@@ -0,0 +1,39 @@
+use either::Either;
+use syntax::{
+    ast::{self, AstNode},
+    SyntaxKind,
+};
+
+use crate::{InlayHint, InlayHintsConfig, InlayKind, InlayTooltip, LifetimeElisionHints};
+
+pub(super) fn hints(
+    acc: &mut Vec<InlayHint>,
+    config: &InlayHintsConfig,
+    statik_or_const: Either<ast::Static, ast::Const>,
+) -> Option<()> {
+    if config.lifetime_elision_hints != LifetimeElisionHints::Always {
+        return None;
+    }
+
+    if let Either::Right(it) = &statik_or_const {
+        if ast::AssocItemList::can_cast(
+            it.syntax().parent().map_or(SyntaxKind::EOF, |it| it.kind()),
+        ) {
+            return None;
+        }
+    }
+
+    if let Some(ast::Type::RefType(ty)) = statik_or_const.either(|it| it.ty(), |it| it.ty()) {
+        if ty.lifetime().is_none() {
+            let t = ty.amp_token()?;
+            acc.push(InlayHint {
+                range: t.text_range(),
+                kind: InlayKind::LifetimeHint,
+                label: "'static".to_owned().into(),
+                tooltip: Some(InlayTooltip::String("Elided static lifetime".into())),
+            });
+        }
+    }
+
+    Some(())
+}