feat(tvix/eval): carry optional SyntaxNode in error type r/4571

This starts paving the way for nicer, source-code based error
reporting.

Right now the code paths in the VM do not emit annotated errors, as we
do not yet preserve that structure from the compiler. However, error
emitting code paths in the compiler have been amended to include known
nodes.

Change-Id: I1b74410ffd891c40cd913361bd73c4336ec8aa5b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6235
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>

1 files changed, 7 insertions, 7 deletions

diff --git a/tvix/eval/src/compiler.rs b/tvix/eval/src/compiler.rs
index 0718f45ba7..92f04c84dc 100644
--- a/tvix/eval/src/compiler.rs
+++ b/tvix/eval/src/compiler.rs
@@ -19,7 +19,7 @@ use rowan::ast::AstNode;
 use std::path::{Path, PathBuf};
 
 use crate::chunk::Chunk;
-use crate::errors::{Error, EvalResult};
+use crate::errors::{ErrorKind, EvalResult};
 use crate::opcode::{CodeIdx, OpCode};
 use crate::value::Value;
 use crate::warnings::{EvalWarning, WarningKind};
@@ -155,7 +155,7 @@ impl Compiler {
             Path::new(&raw_path).to_owned()
         } else if raw_path.starts_with('~') {
             let mut buf = dirs::home_dir().ok_or_else(|| {
-                Error::PathResolution("failed to determine home directory".into())
+                ErrorKind::PathResolution("failed to determine home directory".into())
             })?;
 
             buf.push(&raw_path);
@@ -435,7 +435,7 @@ impl Compiler {
 
                         match self.resolve_local(ident.ident_token().unwrap().text()) {
                             Some(idx) => self.chunk.push_op(OpCode::OpGetLocal(idx)),
-                            None => return Err(Error::UnknownStaticVariable(ident)),
+                            None => return Err(ErrorKind::UnknownStaticVariable(ident).into()),
                         };
                     }
                 }
@@ -663,7 +663,7 @@ impl Compiler {
                     Some(idx) => self.chunk.push_op(OpCode::OpGetLocal(idx)),
                     None => {
                         if self.scope.with_stack.is_empty() {
-                            return Err(Error::UnknownStaticVariable(node));
+                            return Err(ErrorKind::UnknownStaticVariable(node).into());
                         }
 
                         // Variable needs to be dynamically resolved
@@ -836,7 +836,7 @@ fn expr_str_to_string(expr: ast::Str) -> EvalResult<String> {
         }
     }
 
-    return Err(Error::DynamicKeyInLet(expr.syntax().clone()));
+    return Err(ErrorKind::DynamicKeyInLet(expr.syntax().clone()).into());
 }
 
 /// Convert a single identifier path fragment to a string if possible,
@@ -852,7 +852,7 @@ fn attr_to_string(node: ast::Attr) -> EvalResult<String> {
         // inside (i.e. `let ${"a"} = 1; in a` is valid).
         ast::Attr::Dynamic(ref dynamic) => match dynamic.expr().unwrap() {
             ast::Expr::Str(s) => expr_str_to_string(s),
-            _ => Err(Error::DynamicKeyInLet(node.syntax().clone())),
+            _ => Err(ErrorKind::DynamicKeyInLet(node.syntax().clone()).into()),
         },
     }
 }
@@ -868,7 +868,7 @@ pub fn compile(expr: ast::Expr, location: Option<PathBuf>) -> EvalResult<Compila
     let mut root_dir = match location {
         Some(dir) => Ok(dir),
         None => std::env::current_dir().map_err(|e| {
-            Error::PathResolution(format!("could not determine current directory: {}", e))
+            ErrorKind::PathResolution(format!("could not determine current directory: {}", e))
         }),
     }?;