Get merged symbol after resolving indirection alias (#2266)

Author: ahejlsberg

internal/checker/checker.go

@@ -15800,7 +15800,7 @@ func (c *Checker) resolveAlias(symbol *ast.Symbol) *ast.Symbol {
 }
 
 func (c *Checker) resolveIndirectionAlias(source *ast.Symbol, target *ast.Symbol) *ast.Symbol {
-	result := c.resolveAlias(target)
+	result := c.getMergedSymbol(c.resolveAlias(target))
 	if targetLinks := c.aliasSymbolLinks.Get(target); targetLinks.typeOnlyDeclaration != nil {
 		if sourceLinks := c.aliasSymbolLinks.Get(source); sourceLinks.typeOnlyDeclaration == nil {
 			sourceLinks.typeOnlyDeclaration = targetLinks.typeOnlyDeclaration

testdata/baselines/reference/submodule/conformance/umd-augmentation-3.types

@@ -48,7 +48,7 @@ var t = p.x;
 
 === node_modules/math2d/index.d.ts ===
 export as namespace Math2d;
->Math2d : typeof import("node_modules/math2d/index")
+>Math2d : typeof import("node_modules/math2d/index.d.ts")
 
 export = M2D;
 >M2D : typeof import("node_modules/math2d/index.d.ts")

testdata/baselines/reference/submodule/conformance/umd-augmentation-3.types.diff

@@ -12,16 +12,7 @@
 
  var t = p.x;
  >t : number
-@@= skipped -12, +12 lines =@@
-
- === node_modules/math2d/index.d.ts ===
- export as namespace Math2d;
-->Math2d : typeof import("node_modules/math2d/index.d.ts")
-+>Math2d : typeof import("node_modules/math2d/index")
-
- export = M2D;
- >M2D : typeof import("node_modules/math2d/index.d.ts")
-@@= skipped -53, +53 lines =@@
+@@= skipped -65, +65 lines =@@
  	// Add a method to the class
  	interface Vector {
  		reverse(): Math2d.Point;

testdata/baselines/reference/submodule/conformance/umd-augmentation-4.types

@@ -46,7 +46,7 @@ var t = p.x;
 
 === node_modules/math2d/index.d.ts ===
 export as namespace Math2d;
->Math2d : typeof import("node_modules/math2d/index")
+>Math2d : typeof import("node_modules/math2d/index.d.ts")
 
 export = M2D;
 >M2D : typeof import("node_modules/math2d/index.d.ts")

testdata/baselines/reference/submodule/conformance/umd-augmentation-4.types.diff

@@ -1,15 +1,6 @@
 --- old.umd-augmentation-4.types
 +++ new.umd-augmentation-4.types
-@@= skipped -45, +45 lines =@@
-
- === node_modules/math2d/index.d.ts ===
- export as namespace Math2d;
-->Math2d : typeof import("node_modules/math2d/index.d.ts")
-+>Math2d : typeof import("node_modules/math2d/index")
-
- export = M2D;
- >M2D : typeof import("node_modules/math2d/index.d.ts")
-@@= skipped -53, +53 lines =@@
+@@= skipped -98, +98 lines =@@
  	// Add a method to the class
  	interface Vector {
  		reverse(): Math2d.Point;