nicer errors

mers/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mers"
-version = "0.8.11"
+version = "0.8.12"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 description = "dynamically typed but type-checked programming language"
@@ -11,7 +11,7 @@ repository = "https://github.com/Dummi26/mers"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-mers_lib = "0.8.11"
-# mers_lib = { path = "../mers_lib" }
+# mers_lib = "0.8.12"
+mers_lib = { path = "../mers_lib" }
 clap = { version = "4.3.19", features = ["derive"] }
 colored = "2.1.0"

mers/RuntimeErrors.md

@@ -0,0 +1,19 @@
+# Runtime Errors in Mers
+
+This is a list of <small><small><small><small>(hopefully)</small></small></small></small>
+all runtime errors that can occur when running a mers program.
+
+## Explicit
+
+- Calling `panic` with a `String`-type argument will cause a runtime error, using the argument as the error message.
+- Calling `exit` will exit with the given (`Int`) exit code. Usually, a nonzero exit code is considered a program failure. While this isn't really a runtime error, `exit` terminate the program just like an error would.
+
+## Integer-Integer math
+
+Some math functions fail under certain conditions when called with two integer arguments:
+
+- `x.div(0)` will fail because you cannot divide by zero. If at least one argument is a `Float`, this will return Infinity or Not A Number.
+- `x.modulo(0)` will fail
+- ...
+
+## ... (TODO)

mers/src/main.rs

@@ -123,7 +123,7 @@ fn main() {
                             }
                             Ok(_) => {
                                 if let Err(e) = compiled.run(&mut i2) {
-                                    eprintln!("Error while running: {}", e);
+                                    eprintln!("Error while running:\n{e}");
                                     std::process::exit(1);
                                 }
                             }
@@ -149,7 +149,7 @@ fn main() {
                         }
                         Ok(compiled) => {
                             if let Err(e) = compiled.run(&mut i2) {
-                                eprintln!("Error while running: {}", e);
+                                eprintln!("Error while running:\n{e}");
                                 std::process::exit(1);
                             }
                         }