Clean up handling of nonexistent symbol tables

src/main.rs

@@ -69,7 +69,7 @@ fn main() -> Result<(), anyhow::Error> {
     let mut symbol_tables = SymbolTables::new();
     if let Some(initial_tables) = config.symbol_tables {
         for path in initial_tables {
-            symbol_tables.load_table(path, true).unwrap();
+            symbol_tables.load_table(path, true)?;
         }
     }
     Repl::<_, anyhow::Error>::new(EmuState {

src/symbol_table.rs

@@ -27,7 +27,7 @@ impl SymbolTable {
         let mut file = elf::File::open_stream(&mut cached_reader)?;
         let (symtab, symstrtab) = file
             .symbol_table()?
-            .ok_or_else(|| anyhow!("No symbol table in file"))?;
+            .ok_or_else(|| anyhow!("No symbol table in {}", path))?;
         let symbols = symtab
             .iter()
             .skip(1)