Fix test_string_to_string.f90: merge -> optval

Author: zoziha

src/CMakeLists.txt

@@ -34,7 +34,7 @@ set(fppFiles
     stdlib_math_logspace.fypp
     stdlib_string_type.fypp
     stdlib_string_type_constructor.fypp
-    stdlib_string_to_string.fypp
+    stdlib_strings_to_string.fypp
     stdlib_strings.fypp
 )
 

src/Makefile.manual

@@ -32,7 +32,7 @@ SRCFYPP =\
         stdlib_string_type.fypp \
         stdlib_string_type_constructor.fypp \
         stdlib_strings.fypp \
-        stdlib_string_to_string.fypp
+        stdlib_strings_to_string.fypp
 
 SRC = f18estop.f90 \
       stdlib_error.f90 \
@@ -150,14 +150,14 @@ stdlib_stats_distribution_PRNG.o: \
 stdlib_string_type.o: stdlib_ascii.o \
     stdlib_kinds.o
 stdlib_string_type_constructor.o: stdlib_string_type.o \
-    stdlib_string_to_string.o \
+    stdlib_strings_to_string.o \
     stdlib_strings.o
 stdlib_strings.o: stdlib_ascii.o \
     stdlib_string_type.o \
 	stdlib_optval.o \
     stdlib_kinds.o
 stdlib_math.o: stdlib_kinds.o
-stdlib_string_to_string.o: stdlib_strings.o
+stdlib_strings_to_string.o: stdlib_strings.o
 stdlib_math_linspace.o: \
 	stdlib_math.o
 stdlib_math_logspace.o: \

src/stdlib_string_to_string.fypp renamed to src/stdlib_strings_to_string.fypp

@@ -3,6 +3,7 @@ module test_string_to_string
 
     use stdlib_strings, only: to_string, starts_with
     use stdlib_error, only: check
+    use stdlib_optval, only: optval
     implicit none
 
 contains
@@ -13,7 +14,7 @@ subroutine check_formatter(actual, expected, description, partial)
         logical :: stat
         character(len=:), allocatable :: msg
 
-        if (merge(partial, .false., present(partial))) then
+        if (optval(partial, .false.)) then
             stat = starts_with(actual, expected)
         else
             stat = actual == expected