From e03afb1cc481f06e4811c6e126c7c29b521e1da4 Mon Sep 17 00:00:00 2001
From: dcode <dcode@dcode.io>
Date: Fri, 4 Sep 2020 15:19:54 +0200
Subject: [PATCH 1/2] Fix source map column numbers being off by one

---
 src/ast.ts     | 4 ++--
 src/program.ts | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/ast.ts b/src/ast.ts
index b3b4df6258..76f63253c3 100644
--- a/src/ast.ts
+++ b/src/ast.ts
@@ -1583,7 +1583,7 @@ export class Source extends Node {
   /** Rememberd column number. */
   private lineColumn: i32 = 0;
 
-  /** Determines the line number at the specified position. */
+  /** Determines the line number at the specified position. Starts at `1`. */
   lineAt(pos: i32): i32 {
     assert(pos >= 0 && pos < 0x7fffffff);
     var lineCache = this.lineCache;
@@ -1612,7 +1612,7 @@ export class Source extends Node {
     return assert(0);
   }
 
-  /** Gets the column number at the last position queried with `lineAt`. */
+  /** Gets the column number at the last position queried with `lineAt`. Starts at `1`. */
   columnAt(): i32 {
     return this.lineColumn;
   }
diff --git a/src/program.ts b/src/program.ts
index 63fdf560da..05a020452c 100644
--- a/src/program.ts
+++ b/src/program.ts
@@ -3627,7 +3627,7 @@ export class Function extends TypedElement {
           range.debugInfoRef,
           source.debugInfoIndex,
           source.lineAt(range.start),
-          source.columnAt()
+          source.columnAt() - 1 // source maps are 0-based
         );
       }
     }

From 0b59d8d276cb012fbab2d5c199477ce50e1eb65a Mon Sep 17 00:00:00 2001
From: dcode <dcode@dcode.io>
Date: Fri, 4 Sep 2020 15:21:43 +0200
Subject: [PATCH 2/2] update default fwiw, fix typo

---
 src/ast.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/ast.ts b/src/ast.ts
index 76f63253c3..c26c794f8d 100644
--- a/src/ast.ts
+++ b/src/ast.ts
@@ -1580,8 +1580,8 @@ export class Source extends Node {
   /** Cached line starts. */
   private lineCache: i32[] | null = null;
 
-  /** Rememberd column number. */
-  private lineColumn: i32 = 0;
+  /** Remembered column number. */
+  private lineColumn: i32 = 1;
 
   /** Determines the line number at the specified position. Starts at `1`. */
   lineAt(pos: i32): i32 {