[flang] document non-support for PGI ALLOCATE(TYPE(t)::...)

Original-commit: flang-compiler/f18@67420da79cb14cf2f3f7a5aa649b93722807bde7
Reviewed-on: https://github.com/flang-compiler/f18/pull/472
Tree-same-pre-rewrite: false

diff --git a/flang/documentation/Extensions.md b/flang/documentation/Extensions.md
index 6bb0549..f0a2e6c 100644 (file)
--- a/flang/documentation/Extensions.md
+++ b/flang/documentation/Extensions.md
@@ -90,3 +90,4 @@ Extensions and legacy features deliberately not supported
 * `Z` prefix on unquoted hexadecimal constants (dangerous)
 * `T` and `F` as abbreviations for `.TRUE.` and `.FALSE.` (dangerous)
 * Use of host FORMAT labels in internal subprograms (PGI-only feature)
+* ALLOCATE(TYPE(derived)::...) as variant of correct ALLOCATE(derived::...) (PGI only)