Better guard against wrong input with check-cfg any()

Author: Urgau

compiler/rustc_interface/src/interface.rs

@@ -324,11 +324,15 @@ pub fn parse_check_cfg(handler: &EarlyErrorHandler, specs: Vec<String>) -> Check
                 }
 
                 if any_specified {
-                    if !names.is_empty() || !values.is_empty() || values_any_specified {
+                    if names.is_empty()
+                        && values.is_empty()
+                        && !values_specified
+                        && !values_any_specified
+                    {
+                        check_cfg.exhaustive_names = false;
+                    } else {
                         error!("`cfg(any())` can only be provided in isolation");
                     }
-
-                    check_cfg.exhaustive_names = false;
                 } else {
                     for name in names {
                         check_cfg

tests/ui/check-cfg/invalid-arguments.any_values.stderr

@@ -0,0 +1,2 @@
+error: invalid `--check-cfg` argument: `cfg(any(),values())` (`values()` cannot be specified before the names)
+

tests/ui/check-cfg/invalid-arguments.rs

@@ -6,7 +6,7 @@
 // revisions: multiple_values_any not_empty_any not_empty_values_any
 // revisions: values_any_missing_values values_any_before_ident ident_in_values_1
 // revisions: ident_in_values_2 unknown_meta_item_1 unknown_meta_item_2 unknown_meta_item_3
-// revisions: mixed_values_any mixed_any giberich
+// revisions: mixed_values_any mixed_any any_values giberich unterminated
 //
 // compile-flags: -Z unstable-options
 // [anything_else]compile-flags: --check-cfg=anything_else(...)
@@ -29,6 +29,8 @@
 // [unknown_meta_item_3]compile-flags: --check-cfg=cfg(foo,values(test()))
 // [mixed_values_any]compile-flags: --check-cfg=cfg(foo,values("bar",any()))
 // [mixed_any]compile-flags: --check-cfg=cfg(any(),values(any()))
+// [any_values]compile-flags: --check-cfg=cfg(any(),values())
 // [giberich]compile-flags: --check-cfg=cfg(...)
+// [unterminated]compile-flags: --check-cfg=cfg(
 
 fn main() {}

tests/ui/check-cfg/invalid-arguments.unterminated.stderr

@@ -0,0 +1,2 @@
+error: invalid `--check-cfg` argument: `cfg(` (expected `cfg(name, values("value1", "value2", ... "valueN"))`)
+