error functions now return a never type

src/command/session.rs

@@ -36,7 +36,7 @@ pub fn switch(state: &mut State) {
 	let target: String = match if let Some(inner) = args.get(0) { inner.to_str() } else { None } {
 		None		|
 		Some("-")	=>	if let Some(prev) = message(MSG_PREVIOUS) { prev }
-						else { error::missing_target(); panic!() },
+						else { error::missing_target() },
 
 		Some(inner)	=>	inner.to_owned()
 	};

src/error.rs

@@ -1,14 +1,14 @@
 use std::process::exit;
 
 ///	no subcommand that matches user input; code 1
-pub fn no_subcommand(subcommand: String) {
+pub fn no_subcommand(subcommand: String) -> ! {
 	eprintln!("remux: no command match for \"{subcommand}\"");
 	exit(1);
 }
 
 
 ///	target session not found; code 2
-pub fn no_target<S: Into<String>>(target: S) {
+pub fn no_target<S: Into<String>>(target: S) -> ! {
 	let target = target.into();
 	eprintln!("remux: no session \"{target}\" exists");
 	exit(2);
@@ -16,26 +16,26 @@ pub fn no_target<S: Into<String>>(target: S) {
 
 
 ///	help topic doesn't exist; code 3
-pub fn no_help(topic: String) {
+pub fn no_help(topic: String) -> ! {
 	eprintln!("remux: no help for \"{topic}\"");
 	exit(3);
 }
 
 
 ///	user provided no target; code 4
-pub fn missing_target() {
+pub fn missing_target() -> ! {
 	eprintln!("remux: no target provided");
 	exit(4);
 }
 
 ///	refuse to attach to current session; code 4
-pub fn same_session() {
+pub fn same_session() -> ! {
 	eprintln!("remux: cannot attach to same session");
 	exit(4);
 }
 
 ///	a session with the target name already exists; code 4
-pub fn target_exists<S: Into<String>>(target: S) {
+pub fn target_exists<S: Into<String>>(target: S) -> ! {
 	let target = target.into();
 	eprintln!("remux: session \"{target}\" already exists");
 	exit(4);
@@ -43,26 +43,26 @@ pub fn target_exists<S: Into<String>>(target: S) {
 
 
 ///	non-terminal environment prevention; code 5
-pub fn not_terminal() {
+pub fn not_terminal() -> ! {
 	eprintln!("remux: not running from a terminal");
 	exit(5);
 }
 
 
 ///	tried to nest while not in a session; code 6
-pub fn not_nesting() {
+pub fn not_nesting() -> ! {
 	eprintln!("remux: inappropriate nesting flag (-n); not in a session");
 	exit(6);
 }
 
 ///	operation requires nesting flag; code 6
-pub fn prevent_nest() {
+pub fn prevent_nest() -> ! {
 	eprintln!("remux: the nesting flag (-n) is required for nesting operation");
 	exit(6);
 }
 
 ///	operation conflicts with nesting flag; code 6
-pub fn conflict_nest(reason: Option<&'static str>) {
+pub fn conflict_nest(reason: Option<&'static str>) -> ! {
 	if let Some(reason) = reason { eprintln!("remux: inappropriate nesting flag (-n): {reason}"); }
 	else { eprintln!("remux: nesting flag (-n) is inappropriate for this operation."); }
 	exit(6);
@@ -70,7 +70,7 @@ pub fn conflict_nest(reason: Option<&'static str>) {
 
 
 ///	tried to run a session command outside a session; code 7
-pub fn not_in_session(cmd: &'static str) {
+pub fn not_in_session(cmd: &'static str) -> ! {
 	eprintln!("remux: '{cmd}' must be run from within a session");
 	exit(7);
 }

src/state.rs

@@ -67,10 +67,7 @@ impl State<'_> {
 		let from_args = self.target();
 		if from_args.is_some() { return from_args; }
 		else if let Some(repository) = &self.repository { Some(repository.name.clone()) }
-		else {
-			error::missing_target();
-			None
-		}
+		else { error::missing_target() }
 	}
 }