refactor(make,mutt,strace): use "set" for flag table

Author: akinomyoga

completions/make

@@ -110,9 +110,12 @@ _comp_make__truncate_non_unique_paths()
         local target
         for target in "${COMPREPLY[@]}"; do
             local path=${target%/}
-            while [[ ! ${paths[$path]+set} ]] &&
-                paths[$path]=1 &&
-                [[ $path == "$prefix"*/* ]]; do
+            while
+                # shellcheck disable=SC2209
+                [[ ! ${paths[$path]+set} ]] &&
+                    paths[$path]=set &&
+                    [[ $path == "$prefix"*/* ]]
+            do
                 path=${path%/*}
                 nchild[$path]=$((${nchild[$path]-0} + 1))
             done

completions/mutt

@@ -64,8 +64,9 @@ _comp_cmd_mutt__get_conffiles()
 # @var[ref] visited    Dictionary of config files already visited
 _comp_cmd_mutt__get_conffiles__visit()
 {
-    [[ -f $1 && ${visited[$1]-} != yes ]] || return 0
-    visited[$1]=yes
+    [[ -f $1 && ${visited[$1]-} != set ]] || return 0
+    # shellcheck disable=SC2209
+    visited[$1]=set
     conffiles+=("$1")
 
     local -a newconffiles=($(command sed -n 's|^source[[:space:]]\{1,\}\([^[:space:]]\{1,\}\).*$|\1|p' "$1"))

completions/strace

@@ -38,9 +38,10 @@ _strace()
                             local define syscall rest
                             local -A syscalls
                             while read -r define syscall rest; do
+                                # shellcheck disable=SC2209
                                 [[ $define == "#define" &&
                                     $syscall =~ ^__NR_(.+) ]] &&
-                                    syscalls[${BASH_REMATCH[1]}]=1
+                                    syscalls[${BASH_REMATCH[1]}]=set
                             done 2>/dev/null </usr/include/asm/unistd.h
                             if ((${#syscalls[@]} == 0)); then
                                 local unistd arch=$(command uname -m)
@@ -50,9 +51,10 @@ _strace()
                                     unistd=/usr/include/asm/unistd_64.h
                                 fi
                                 while read -r define syscall rest; do
+                                    # shellcheck disable=SC2209
                                     [[ $define == "#define" &&
                                         $syscall =~ ^__NR_(.+) ]] &&
-                                        syscalls[${BASH_REMATCH[1]}]=1
+                                        syscalls[${BASH_REMATCH[1]}]=set
                                 done 2>/dev/null <$unistd
                             fi