Keep the readable half of a provider's error for the settings row

ONNX Runtime's errors open with a source path and a template signature;
the first 160 characters of a CUDA failure were all signature. The
reason now starts at the first word a person can act on.

core/dr-inference-engine/src/probe.rs

@@ -192,8 +192,18 @@ fn time_rung(
     Ok((times[1], key))
 }
 
+/// The part of a provider's error a person can act on. ONNX Runtime's
+/// begin with a source path and a C++ template signature; the words —
+/// "CUDA failure 999: unknown error", "FAIL : Failed to load library" —
+/// come after, and the settings row has room for one line of them.
 fn first_line(s: &str) -> String {
-    s.lines().next().unwrap_or("").chars().take(160).collect()
+    let line = s.lines().next().unwrap_or("");
+    let start = ["failure", "FAIL :", "Error:", "error:"]
+        .iter()
+        .filter_map(|m| line.find(m))
+        .min()
+        .unwrap_or(0);
+    line[start..].chars().take(200).collect()
 }
 
 /// Everything a change of which should re-probe: the runtime and where it