Improve error further

Author: benjie

__tests__/__snapshots__/include.test.ts.snap

@@ -1,7 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`compiles an included file, and won't get stuck in an infinite include loop 1`] = `
-"Circular include detected - '~/migrations/fixtures/foo.sql' is included again! Trace:
+"Circular include detected - '~/migrations/fixtures/foo.sql' is included again! Import statement: \`--!include foo.sql\`; trace:
   ~/migrations/fixtures/foo.sql
   ~/migrations/current.sql"
 `;

src/migration.ts

@@ -154,7 +154,7 @@ export async function compileIncludes(
   // Go through these matches and resolve their full paths, checking they are allowed
   const sqlPathByRawSqlPath = Object.create(null) as Record<string, string>;
   for (const match of matches) {
-    const [, rawSqlPath] = match;
+    const [line, rawSqlPath] = match;
     const sqlPath = await realpathOrNull(`${fixturesPath}/${rawSqlPath}`);
 
     if (!sqlPath) {
@@ -165,7 +165,7 @@ export async function compileIncludes(
 
     if (processedFiles.has(sqlPath)) {
       throw new Error(
-        `Circular include detected - '${sqlPath}' is included again! Trace:\n  ${[...processedFiles].reverse().join("\n  ")}`,
+        `Circular include detected - '${sqlPath}' is included again! Import statement: \`${line}\`; trace:\n  ${[...processedFiles].reverse().join("\n  ")}`,
       );
     }