Try installing fypp in another way

.github/workflows/ci_windows.yml

@@ -56,7 +56,12 @@ jobs:
           ninja
           mingw-w64-x86_64-minizip-ng
 
-    - name: Install fypp
+    - name: Install fypp (MSYS)
+      if: contains(matrix.msystem, 'MSYS')
+      run: pacman -S --noconfirm python-pip && pip install fypp
+
+    - name: Install fypp (MinGW)
+      if: contains(matrix.msystem, 'MINGW')
       run: pip install fypp
 
     - run: >-

src/stdlib_array.fypp

@@ -17,9 +17,7 @@ module stdlib_array
     !> Helper class to allocate t_array as an abstract type.
     type, public :: t_array_wrapper
         class(t_array), allocatable :: array
-
     contains
-
         #:for k1, t1 in KINDS_TYPES
             #:for rank in RANKS
                 generic :: allocate_array => allocate_array_${t1[0]}$${k1}$_${rank}$
@@ -45,7 +43,7 @@ contains
     #:for k1, t1 in KINDS_TYPES
         #:for rank in RANKS
             !> Allocate an instance of the array within the wrapper.
-            subroutine allocate_array_${t1[0]}$${k1}$_${rank}$(wrapper, array, stat, msg)
+            subroutine allocate_array_${t1[0]}$${k1}$_${rank}$ (wrapper, array, stat, msg)
                 class(t_array_wrapper), intent(out) :: wrapper
                 ${t1}$, intent(in) :: array${ranksuffix(rank)}$
                 integer, intent(out) :: stat