Add docs for ast_ty_to_prim_ty

Manishearth · Manishearth · commit e184c2daf16f · 2015-10-15T20:14:52.000+05:30
Confusion about what this does caused a bug in Servo's lints.
diff --git a/src/librustc/middle/astconv_util.rs b/src/librustc/middle/astconv_util.rs
@@ -60,6 +60,8 @@ pub fn prim_ty_to_ty<'tcx>(tcx: &ty::ctxt<'tcx>,
     }
 }
 
+/// If a type in the AST is a primitive type, return the ty::Ty corresponding
+/// to it.
 pub fn ast_ty_to_prim_ty<'tcx>(tcx: &ty::ctxt<'tcx>, ast_ty: &ast::Ty)
                                -> Option<Ty<'tcx>> {
     if let ast::TyPath(None, ref path) = ast_ty.node {

Original file line number	Diff line number	Diff line change
`@@ -60,6 +60,8 @@ pub fn prim_ty_to_ty<'tcx>(tcx: &ty::ctxt<'tcx>,`
`60`	`60`	`}`
`61`	`61`	`}`
`62`	`62`
	`63`	`+/// If a type in the AST is a primitive type, return the ty::Ty corresponding`
	`64`	`+/// to it.`
`63`	`65`	`pub fn ast_ty_to_prim_ty<'tcx>(tcx: &ty::ctxt<'tcx>, ast_ty: &ast::Ty)`
`64`	`66`	`-> Option<Ty<'tcx>> {`
`65`	`67`	`if let ast::TyPath(None, ref path) = ast_ty.node {`