Question

I have developed some code, and I’m facing problem with error flagging of the Tcl interpreter on a Linux machine.

#!/usr/bin/tclsh
if {1} {
  puts "abc1"
} elseif {} {
  puts "abc2" 
}

The above code is not flagging error for "elseif" condition until it get into the
elseif condition.
Is there any way to check this kind of typo error done unintentionally.

Answer 1

To elaborate on Donal’s answer, Tcl does not find errors at compile time because in the general case it cannot be done, any code executed before the if might have redefined the if command, so it could be valid, the only way to determine if this is the case is to run the code (i.e. this is the halting problem)

consider this script:

gets stdin input
if {$input == "fail"} {
  rename if if_
  proc if {arg1 arg2 arg3} {
    puts "ha ha"
  }
}
if {1} { puts "success"}

clearly it is impossible to statically determine if the if {1} line has the right number of arguments without running the program

TCL really has virtually no syntax, there is nothing a compiler can check, the best you can do is Lint style warnings, which will only be accurate in some cases