an earlier directory's applied results stay claimed for later ones

1 files changed, 6 insertions, 0 deletions

diff --git a/internal/plan/chain.go b/internal/plan/chain.go
index b32cc7d..bb4876b 100644
--- a/internal/plan/chain.go
+++ b/internal/plan/chain.go
@@ -28,6 +28,12 @@ func NewClaims() *Claims {
 	return &Claims{taken: claimed{}}
 }
 
+// Claim marks path as spoken for: a later Build call of the run treats it
+// as another step's result, never displacing it (spec §7.4).
+func (c *Claims) Claim(path string) {
+	c.taken[path] = true
+}
+
 // Input is one file and the rules that matched it, in match order.
 type Input struct {
 	File  scan.File