match +,- {
;commented out
}    

proc test
locals
  mystruct structure ?
endl

stdcall someprocedure, mystruct  <- need to pass the address of mystruct here
endp
    

The only way I can think of that works is to use lea to get the address in the stack.

In Masm we use the ADDR operator when dealing with stack variables and structures.

IF IsReg
end if
    

    macro mov op1,op2
     {
      if op1 in <ds,es,fs,gs,ss> & op2 in <cs,ds,es,fs,gs,ss>
        push  op2
        pop   op1
      else
        mov   op1,op2
      end if
     }    

Thanks revolution. Btw, that special character ~ what is it used for in fasm? I can't find it in the documentation.

name proc
.data
  somevariable dd 10
.code
  xor eax,eax
  xor eax,eax
  ret
name endp
    

proc name
begin
  iglobal
    somevariable dd 10
  endg

  xor eax,eax
  xor eax,eax
  return
endp    

The documentation is: here

format PE GUI 4.0
include 'win32a.inc'
include 'accstrings.inc'

main:
      invoke MessageBox,NULL,<string "Hello, world!",0>,<string "Title",0>,MB_OK
  
    message2 dstring "Full string fusion",0
   title2 dstring "Full string fusion",0
     invoke MessageBox,NULL,message2,title2,MB_OK
        
    title1 dustring "fusion",0
        message1 dustring "Substring fusion",0
    invoke MessageBoxW,NULL,message1,title1,MB_OK
       
xor eax,eax
ret

IncludeStrings

data import
   library user32,"user32.dll"
   
   import user32,\
     MessageBox,'MessageBoxA',\
       MessageBoxW,'MessageBoxW'
end data    

rept 1000 {
local strlbl
  strlbl dstring 'test string',0
}    

rept 228 {
local strlbl
  strlbl dstring `strlbl,0
}    

1000 strings -> 18s

With unique strings, the things got even worse: