syntax: extra white-space before trailing comments after some compound commands

[antichris]

Some extra whitespace is added before trailing comments after

1. brace groups

   {
   	foo #inline
   } #trailing
   
   foo() {
   	bar #inline
   } #trailing
   

   {
   	foo #inline
   }    #trailing
   
   foo() {
   	bar #inline
   }    #trailing
   

2. subshells

   (
   	foo #inline
   ) #trailing
   
   foo() (
   	bar #inline
   ) #trailing
   

   (
   	foo #inline
   )    #trailing
   
   foo() (
   	bar #inline
   )    #trailing
   

3. command substitutions

   foo=$(
   	bar #inline
   ) #trailing
   

   foo=$(
   	bar #inline
   )    #trailing
   

4. if clauses

   if foo; then
   	bar #inline
   fi #trailing
   

   if foo; then
   	bar #inline
   fi   #trailing
   

Altogether that looks like a weak effort to align with the above inline comment, as it is done for case.

case $foo in
?) bar;; #inline
esac #trailing

case $foo in
?) bar ;; #inline
esac      #trailing

Nothing of the sort is being done to loop constructs (for, while and until), for which output is the same as input.

for foo; do
	bar #inline
done #trailing

while foo; do
	bar #inline
done #trailing

until foo; do
	bar #inline
done #trailing

for foo; do
	bar #inline
done #trailing

while foo; do
	bar #inline
done #trailing

until foo; do
	bar #inline
done #trailing

I'm not sure how often trailing comments on these constructs are used in practice, and whether they really are most commonly used for a continuation of the previous line (I'm inclined to doubt that is the case, but I may be biased).